style.css

/** Dropdown.js */

.dropdown-button button {
    background: #fd6645;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0.6rem;
    cursor: pointer;
    position: relative;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    padding: 0 1em;
    height: 2.2em;
    font-family: inherit;
    font-weight: inherit;
    font-size: 1rem;
    color: inherit;
    border: 1px solid #d5d7dd;
    border-radius: .25em;
    -webkit-box-shadow: none;
    box-shadow: none;
    -webkit-transition: all .2s ease-in-out;
    transition: all .2s ease-in-out;
}

.dropdown-button.color {
    padding: .2em;
}

.dropdown {
    z-index: 1;
    position: absolute;
    width: 200px;
    border: 1px solid #d5d7dd;
    border-radius: .25em;
    margin-top: 0.3rem;
    background: white;
    transition: all 0.1s cubic-bezier(0.16, 1, 0.5, 1);
    transform: translateY(0.5rem);
    visibility: hidden;
    opacity: 0;
}

.dropdown div {
    display: flex;
    align-items: center;
    padding: .5em .5em;
    text-decoration: none;
    color: #2e3138;
}

.dropdown .disabled {
    background-color: #afafaf;
    color: white;
    text-decoration: line-through;
    text-decoration-color: #5c6370;
    cursor: not-allowed;
}

.show {
    transform: translateY(0rem);
    visibility: visible;
    opacity: 1;
}