.container{
    /*padding: 50px;*/
    background:#fff;
}
.topic-box{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.topic-box-main{
    width: 30%;
    height: 320px;
    background-color: #fff;
    border-radius: 4.5px;
    box-shadow: rgb(0 0 0 / 15%) 0px 0px 20px 0px;
    margin-top: 30px;
    box-sizing: border-box;
    cursor: pointer;
}
.topic-box-main:hover{
    transform: scale(1.01);
}
.topic-box-main img{
    height: 240px;
    width: 100%;
    border-radius: 4.5px 4.5px 0.5px 0px;
}
.topic-box-main_title{
    display: flex;
    height: 80px;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 18px;
}