style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

*, *::after, *::before {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    font-family: "Poppins", serif;
    color: #ccd9e1;
}

html {
    font-size: 62.5%;
}

main {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    padding-top: 6rem;
}

.dropdown-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.btn {
    border: none;
    width: fit-content;
    border-radius: .6rem;
    font-size: 1.6rem;
    color: white;
    background-color: #141617;
    display: flex;
    align-items: center;
    gap: .2rem;
    padding-block: 1.2rem;
    padding-left: 2.2rem;
    padding-right: 1.8rem;
    cursor: pointer;
    img {
        height: 2.2rem;
        width: auto;
        object-fit: contain;
    }
}

.dropdown-list {
    list-style: none;
    display: grid;
    width: 25rem;
    gap: .8rem;
    background-color: #1f2123;
    border-radius: 1.2rem;
    padding: .8rem;
    li {
        display: flex;
        align-items: center;
        justify-content: space-between;
        border-radius: .8rem;
        padding-inline: 1.8rem;
        padding-block: 1.4rem;
        background-color: transparent;
        transition: background-color .3s ease, padding-inline .3s ease;
        cursor: pointer;
        a {
            text-decoration: none;
            color: white;
            font-size: 1.6rem;
        }
        img {
            height: 2rem;
            width: auto;
            object-fit: contain;
            opacity: 0;
            visibility: hidden;
            transition: opacity .1s ease;
        }
        &:hover {
            background-color: #2b2d2e;
            padding-inline: 2.4rem;
            img {
                opacity: 1;
                visibility: visible;
            }
        }
    }
}

.dropdown {
    margin-top: .8rem;
    height: 0;
    overflow: hidden;
    transition: height .3s ease;
}