.size-selector {
    margin-top: 20px;
}

    .size-selector h3 {
        font-size: 16px;
        font-weight: bold;
    }

    .size-selector ul {
        display: flex;
        justify-content: flex-start;
        list-style-type: none;
        padding: 0;
        margin: 10px 0;
        width: 100%;
    }

    .size-selector .size-option {
        flex-basis: calc(100% / 6);
        display: flex;
        justify-content: center;
        align-items: center;
        height: 40px;
        border: 1px solid #ccc;
        border-radius: 4px;
        margin-right: 10px;
        cursor: pointer;
    }

        .size-selector .size-option:hover {
            background-color: #f5f5f5;
        }

        .size-selector .size-option.selected {
            background-color: #000;
            color: #fff;
        }