stable-diffusion-webui/extensions/sd-webui-aspect-ratio-helper/style.css

#txt2img_size_toolbox, #img2img_size_toolbox {
    min-width: unset !important;
    gap: 0;
}

#txt2img_ratio, #img2img_ratio {
    padding: 0px;
    min-width: unset;
    max-width: fit-content;
}

#txt2img_ratio select, #img2img_ratio select {
    background: var(--background-fill-primary);
    border: 1px solid var(--block-border-color);
    color: var(--block-label-text-color);
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: none;
    tab-size: 4;
    font-size: 14px;
    line-height: 1.4;
    box-sizing: border-box;
    position: relative;
    border-radius: 8px;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    padding-right: 1px;
    margin-bottom: 10px;
    padding-left: 2px;
    text-align: center;
    min-width: 2.5em;
}

.arh-btn-row button {
    min-width: fit-content;
}