look at this CSS code and remove useless lines and data. remove anything that may cause potential errors, rewrite the whole css
css:

html, body, h1, h2, h3, h4, p, a, ul, li, div, main, header, section, footer, img {
margin: 0;
padding: 0;
border: 0;
font-size: 100%;
font: inherit;
vertical-align: baseline;
box-sizing: border-box;
}

body {
font-family: Arial, sans-serif;
line-height: 1.5;
background: #f1f1f1;
color: #333;
max-width: 1200px;
margin: 0 auto;
}

header {
background: #32612D;
padding: 0.5rem 2rem;
}

h1 {
color: #fff;
display: inline;
}

nav ul {
display: inline;
list-style: none;
}

nav ul li {
display: inline;
margin-left: 1rem;
}

nav ul li a {
text-decoration: none;
color: #fff;
cursor: pointer;
}

nav ul li a:hover {
color: #b3b3b3;
}

.slideshow-container {
width: 100%;
position: relative;
margin: 1rem 0;
}

.mySlides {
display:none;
}

.mySlides img {
width: 100%;
height: auto;
}

.special-offers-container {
display: flex;
justify-content: space-around;
align-items: center;
flex-wrap: wrap;
margin: 1rem 0;
}

.special-offer {
width: 200px;
padding: 1rem;
text-align: center;
margin: 1rem;
background-color: #ADC3AB;
border-radius: 5px;
box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
transition: all 0.3s ease;
}

.special-offer:hover {
box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
transform: translateY(-5px);
}

.special-offer img {
width: 100%;
height: auto;
margin-bottom: 0.5rem;
border-radius: 5px;
}

.modal {
display: none;
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.5);
z-index: 1; /*Make sure the modal is on top */
overflow: auto;
}

.modal-content {
background-color: #fefefe;
padding: 2rem;
margin: 10% auto;
width: 30%;
min-width: 300px;
max-width: 80%;
text-align: center;
border-radius: 5px;
box-shadow: 0 1px 8px rgba(0, 0, 0, 0.1);
}

.close {
display:block;
text-align: right;
font-size: 2rem;
color: #333;
cursor: pointer;
}

footer {
background: #32612D;
padding: 1rem;
text-align: center;
}

footer p {
color: #fff;
margin-bottom: 1rem;
}

footer ul {
list-style: none;
}

footer ul li {
display: inline;
margin: 0.5rem;
}

footer ul li a {
text-decoration: none;
color: #fff;
}

@media screen and (max-width: 768px) {
.special-offers-container {
flex-direction: column;
}
}

@media screen and (max-width: 480px) {
header {
text-align: center;
}

h1 {
display: block;
margin-bottom: 1rem;
}
}
///...
.catalog {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 2rem 0;
}

.catalog-item {
    width: 200px;
    padding: 1rem;
    margin: 1rem;
    background-color: #ADC3AB;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    
}

.catalog-item:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.catalog-item img {
    width: 100%;
    height: auto;
    margin-bottom: 0.5rem;
    border-radius: 5px;
}

.catalog-item h3 {
    margin-bottom: 0.5rem;
}

.catalog-item p {
    margin-bottom: 0.5rem;
}

.catalog-item button {
    background-color: #32612D;
    color: #fff;
    padding: 0.5rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.catalog-item button:hover {
    background-color: #ADC3AB;
}