.popular_topic {
    width: 80%;
    margin: auto;
}
.popular_topic .btn  {
    padding: 0.5rem 2rem;
    background-color: #19ac90;
    color: #fff;
    box-shadow: inset 0px 2px 10px 3px #ffffffb3;
}
.popular_topic .search {
    background-color: #19ac90;
    padding: 1rem;
    border-radius: 0.5rem;
}
.popular_topic .item {
    position: relative;
    width: 100%;
    align-items: center;
    display: flex;
    padding: 1rem;
    border-bottom: 0.1rem solid #c6c6c6;
    cursor: pointer;
}
.popular_topic .item i{
    right: 0;
    position: absolute;
    background-color: #8a8a8a;
    border-radius: 50%;
    padding: 0.6rem;
    color: #fff;
}
.popular_topic  .title {
    font-weight: bold;
    font-size: 1.8rem;
    padding-top: 1rem;
    padding-bottom: 1rem;
}
.popular_topic .view_more {
    text-align: right;
    padding: 1rem;
    font-style: italic;
    color: #3f94df;
}
.popular_topic .topic_content {
    padding: 1rem;
    background-color: #fff;
    display: block;
    margin-top: 6rem;
    box-shadow: 3px -1px 9px 0px #c6c6c6;
}