Based on the attached CSS of my FiveM Inventory script, can you modify the CSS to improve the overall look of the GUI without breaking anything or requiring any changes to the HTML?
@import url("https://fonts.googleapis.com/css2?family=Open+Sans&display=swap");

body {
    margin: 0;
}

div {
    font-family: "Open Sans", sans-serif;
}

::-webkit-scrollbar {
    display: none;
}

#app {
    height: 100vh;
    width: 100vw;
    background: transparent;
}

.inventory-container {
    height: 100%;
    width: 100%;
}

/* Player Inventory Styles */

.player-inventory {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-content: flex-start;
    position: absolute;
    top: 50vh;
    left: 14vw;
    width: 28vw;
    height: 47.16vh;
    overflow-x: hidden;
    overflow-y: scroll;
    transform: translateY(-50%);
}

.player-inventory-header {
    box-sizing: border-box;
    position: absolute;
    top: 20.8vh;
    left: 14vw;
    width: 27.9vw;
    height: fit-content;
    font-weight: bolder;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

/* Other Inventory Styles */

.other-inventory {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-content: flex-start;
    position: absolute;
    top: 50vh;
    right: 14vw;
    width: 28vw;
    height: 47.16vh;
    overflow-x: hidden;
    overflow-y: scroll;
    transform: translateY(-50%);
}

.other-inventory-header {
    box-sizing: border-box;
    position: absolute;
    top: 20.8vh;
    right: 14.1vw;
    width: 27.9vw;
    height: fit-content;
    font-weight: bolder;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

/* Centered Styles */

.centered-player-inventory {
    top: 50vh;
    left: 50vw;
    transform: translate(-50%, -50%);
}

.centered-inventory-header {
    box-sizing: border-box;
    position: absolute;
    top: 20.8vh;
    width: 27.9vw;
    left: 50vw;
    transform: translateX(-50%);
    height: fit-content;
    font-weight: bolder;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.labels-container {
    display: flex;
    width: 100%;
}

.inventory-label {
    flex-grow: 1;
}

.item-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    align-content: flex-start;
    width: 100%;
}

.item-slot {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: calc(20% - 2px);
    height: 10vh;
    background-color: rgba(0, 0, 0, 0.3);
}

.item-slot-img {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

.item-slot-img img {
    width: 50%;
    height: auto;
}

.item-slot-key {
    font-weight: bolder;
    color: #000000;
    position: absolute;
    top: 5px;
    left: 5px;
    width: 20px;
    height: 20px;
    background-color: #cccccc;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 3px;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.2);
    background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
}

.item-slot-amount {
    font-size: 0.7vh;
    color: white;
    position: absolute;
    top: 5px;
    right: 5px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.item-price {
    font-size: 0.7vh;
    color: white;
    position: absolute;
    top: 5px;
    left: 5px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.item-slot-label {
    position: absolute;
    white-space: nowrap;
    bottom: 0;
    height: 1vh;
    width: 100%;
    background-color: #cccccc;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.1), 0 2px 2px rgba(0, 0, 0, 0.2);
    background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1));
}

.item-slot-durability {
    position: absolute;
    bottom: 0vh;
    width: 99%;
    height: 6px;
    background-color: #2d2d2d;
}

.item-slot-durability-fill {
    height: 100%;
    transition: width 0.2s;
}

.item-slot-durability-fill.high {
    background-color: green;
}

.item-slot-durability-fill.medium {
    background-color: yellow;
}

.item-slot-durability-fill.low {
    background-color: red;
}

.item-slot-label > p {
    text-transform: uppercase;
    font-weight: bolder;
    color: #000000;
    font-size: 0.7vh;
    text-align: center;
}

/* Weight Bar Styles */

.current-weight > p {
    text-align: right;
    padding-right: 5px;
}

.weight-bar {
    width: 100%;
    background-color: #2d2d2d;
}

.weight-bar-fill {
    height: 5px;
    transition: width 0.2s;
}

.weight-bar-fill.low {
    background-color: green;
}

.weight-bar-fill.medium {
    background-color: yellow;
}

.weight-bar-fill.high {
    background-color: red;
}

/* Hotbar */

.hotbar-container {
    display: flex;
    justify-content: center;
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    padding-bottom: 3vh;
}

.hotbar {
    display: flex;
    justify-content: space-between;
    width: 25vw;
    padding: 0 10px;
}

.notification-container {
    display: flex;
    justify-content: center;
    position: fixed;
    bottom: 2vh;
    left: 50%;
    transform: translate(-50%);
}

.notification-slot {
    position: relative;
    width: 10vh;
    height: 10vh;
    background-color: rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
}

.notification-title {
    color: white;
    align-self: flex-start;
    margin-top: 5px;
    margin-left: 5px;
}

.notification-title p {
    margin: 0;
    padding: 0;
    font-size: 0.7vh;
}

.required-item-container {
    display: flex;
    justify-content: center;
    position: fixed;
    bottom: 2vh;
    left: 50%;
    transform: translate(-50%);
}

.required-item {
    display: flex;
    justify-content: center;
    width: 25vw;
    padding: 0 10px;
}

.required-item .item-slot {
    margin-left: 10px;
}

.context-menu {
    position: absolute;
    font-size: 1vh;
    border-radius: 4px;
    background-color: #2c2c2c;
    border: 1px solid #000;
    z-index: 1000;
    width: fit-content;
    cursor: pointer;
    color: #ffffff;
    list-style-type: none;
    margin: 0;
    padding: 0;
    box-shadow: 0 0 0 1px rgb(255 255 255 / 8%), 0 2px 2px rgb(0 0 0 / 3%), 0 4px 4px rgb(0 0 0 / 4%), 0 10px 8px rgb(0 0 0 / 5%), 0 15px 15px rgb(0 0 0 / 6%), 0 30px 30px rgb(0 0 0 / 7%), 0 70px 65px rgb(0 0 0 / 9%);
}

.context-menu li {
    padding: 8px 12px;
    display: flex;
    align-items: center;
}

.context-menu li:hover {
    background-color: #444444;
}

.submenu {
    position: absolute;
    top: 0;
    left: 100%;
    font-size: 0.9vh;
    background-color: #2c2c2c;
    border: 1px solid #000;
    border-radius: 4px;
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: none;
    box-shadow: 0 0 0 1px rgb(255 255 255 / 8%), 0 2px 2px rgb(0 0 0 / 3%), 0 4px 4px rgb(0 0 0 / 4%), 0 10px 8px rgb(0 0 0 / 5%), 0 15px 15px rgb(0 0 0 / 6%), 0 30px 30px rgb(0 0 0 / 7%), 0 70px 65px rgb(0 0 0 / 9%);
    z-index: 1001;
}

.context-menu li:hover .submenu {
    display: block;
}

.submenu li {
    padding: 8px 12px;
    display: flex;
    align-items: center;
}

.submenu li:hover {
    background-color: #444444;
}

/* Input Container */

.input-container {
    position: absolute;
    width: 4%;
    top: calc(26% + ((47.16% - 3vh) / 2));
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #2c2c2c;
    border-radius: 4px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 1px rgb(255 255 255 / 8%), 0 2px 2px rgb(0 0 0 / 3%), 0 4px 4px rgb(0 0 0 / 4%), 0 10px 8px rgb(0 0 0 / 5%), 0 15px 15px rgb(0 0 0 / 6%), 0 30px 30px rgb(0 0 0 / 7%), 0 70px 65px rgb(0 0 0 / 9%);
}

.input-wrapper {
    display: flex;
    align-items: center;
}

.input-container input {
    border: none;
    background-color: transparent;
    color: white;
    font-size: 1vh;
    width: 85%;
    outline: none;
    text-align: center;
    flex: 1;
}

.clear-button {
    margin-left: 5px;
    background-color: #2c2c2c;
    border: none;
}

.clear-button .fas {
    color: white;
}

.custom-tooltip {
    max-width: 6vw;
}

.custom-tooltip .tooltip-header {
    font-weight: bold;
    margin-bottom: 8px;
}

.custom-tooltip .tooltip-divider {
    border: none;
    border-top: 1px solid #ccc;
    margin: 5px 0;
}

.custom-tooltip .tooltip-description {
    font-size: 0.9em;
    margin-bottom: 10px;
}

.custom-tooltip .tooltip-info {
    font-size: 0.9em;
    margin: 5px 0;
    margin-bottom: 10px;
}

.custom-tooltip .tooltip-info-key {
    font-weight: bold;
}

.custom-tooltip .tooltip-weight {
    font-size: 0.8em;
    text-align: right;
}

.weapon-attachments {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 12vw;
    height: 21vh;
    border-radius: 50%;
    margin: 0 auto;
    top: 50%;
    left: 15%;
    position: absolute;
    transform: translate(-50%, -50%);
}

.weapon {
    position: absolute;
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.attachment-slot {
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
}

.attachment-slot img {
    width: 75%;
    height: auto;
}

.attachment-slot:nth-child(0) {
    transform: rotate(0deg) translate(150px) rotate(0deg);
}

.attachment-slot:nth-child(1) {
    transform: rotate(0deg) translate(150px) rotate(0deg);
}

.attachment-slot:nth-child(2) {
    transform: rotate(60deg) translate(150px) rotate(-60deg);
}

.attachment-slot:nth-child(3) {
    transform: rotate(120deg) translate(150px) rotate(-120deg);
}

.attachment-slot:nth-child(4) {
    transform: rotate(180deg) translate(150px) rotate(-180deg);
}

.attachment-slot:nth-child(5) {
    transform: rotate(240deg) translate(150px) rotate(-240deg);
}

.attachment-slot:nth-child(6) {
    transform: rotate(300deg) translate(150px) rotate(-300deg);
}

.attachment-slot:nth-child(7) {
    transform: rotate(0deg) translate(150px) rotate(0deg);
}