style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgb(160, 158, 156);
    min-height: 100vh;
}

.wrapper {
    width: 420px;
    background-color: #fff;
    border-radius: 7px;
    padding: 28px 28px;
}
.wrapper header {
    font-size: 28px;
    font-weight: 500;
    text-align: center;
}
.wrapper .search {
    margin: 35px 0 18px;
    position: relative;
}
.search input {
    height: 53px;
    width: 100%;
    outline: none;
    border: 1px solid #999;
    border-radius: 5px;
    font-size: 16px;
    padding: 0 42px;
}
.search :where(i, span) {
    position: absolute;
    top: 50%;
    color: #999;
    transform: translateY(-50%);
}
.search input::placeholder{
    color: #b8b8b8;
}
.search input:focus{
    border: 2px solid #4d59fb;
    padding: 0 41px;
}
.search i {
    left: 18px;
    font-size: 16px;
    pointer-events: none;
}
.search  input:focus  ~ i {
    color: #4d59fb;
}
.search span {
    right: 15px;
    cursor: pointer;
    font-size: 18px;
    display: none;
}
.search input:valid ~ span {
    display: block;
}
.wrapper ul li{
    display: flex;
    margin-bottom: 14px;
    padding-bottom: 17px;
    border-bottom: 1px solid #ccc;
    justify-content: space-between;
    align-items: center;
}
ul .word p{
    font-size: 22px;
    font-weight: 500;
}
.wrapper .info-text {
    font-size: 13px;
    color: #9a9a9a;
    margin: -3px 0 -10px;
}
.wrapper ul {
    height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}
ul .word i {
    cursor: pointer;
    font-size: 15px;
    color: #999;
}
ul li:last-child{
    margin-bottom: 0px;
    padding-bottom: 0px;
    border-bottom: 0px;
}
.content li .details{
    border-left: 3px solid #4d59fb;
    border-radius: 4px 0 0 4px;
    padding-left: 10px;
}
.content li .details p {
    font-size: 17px;
    color: #7e7e7e;
}
.synonyms .details .list {
    display: flex;
    flex-wrap: wrap;
}
.synonyms .details .list span {
    margin-right: 5px;
    text-decoration: underline;
    cursor: pointer;
}
.info-text span{
    font-weight: 500;
}
.wrapper.active ul {
    height: 303px;
    opacity: 1;
}
.wrapper.active ul{
    display: block;
}
.wrapper.active .info-text {
    display: none;
}
ul .content {
    max-height: 215px;
    overflow-y: auto;
}
ul .content::-webkit-scrollbar{
    width: 0px;
}