* {
    margin: 0;
    padding: 0;
}

body {
    background: #f3f3f3;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    position: relative;
}

.container::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border: 2px solid #333;
    border-top: 0;
    border-right: 0;
    border-bottom-left-radius: 4px;
    top: 20px;
    right: 15px;
    transform: rotate(-45deg);
    transition: transform 0.3s;
}

.container.active::after {
    top: 23px;
    transform: rotate(135deg);
}

.container.active .options {
    visibility: visible;
    opacity: 1;
}

.container .text-box,
.container .options {
    box-shadow: 0 0 10px rgba(165, 165, 165, 0.2);
    border-radius: 5px;
    background: #fff;
    font-size: 20px;
    cursor: pointer;
}

.container .text-box {
    position: relative;
    border: none;
    padding: 16px 20px;
}

.container .text-box:focus-visible {
    outline: 0;
}

.container .options {
    position: relative;
    margin-top: 15px;
    background: #fff;
    color: #555;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s, visibility 0.3s;
}

.container .options::before {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background-image: linear-gradient(
        to right bottom,
        #fff 50%,
        transparent 50%
    );
    transform: translateX(-50%) rotate(45deg);
    left: 50%;
    top: -5px;
}

.container .item {
    padding: 10px 20px;
    transition: color 0.3s, background 0.3s;
    display: flex;
    align-items: center;
}

.container .item:first-child {
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
}

.container .item:last-child {
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

.container .item:hover,
.container .item.active {
    color: #fff;
    background: deepskyblue;
}

.container .iconfont {
    margin-right: 5px;
}