.abt {
    margin-left: 12%;
    margin-top: 5vw;
    float: left;
}
.abt span {
    display: block;
}
.t1 {
    font-size: 3rem;
    font-weight: bold;
}
.t2 {
    font-size: 2.5rem;
    color: #ccc;
    margin-top: 20px;
}

.caselist {
    width: 70%;
    height: auto;
    overflow: hidden;
    margin-top: 5vw;
    float: right;
}
.caselist li {
    width: 30%;
    height: auto;
    float: left;
    overflow: hidden;
    margin: 0 0 50px 5%;
}
.caselist li:nth-child(3n+1) {
    margin-left: 0;
}
.caselist li img {
    display: block;
    width: 100%;
    height: 12vw;
    object-fit: cover;
    cursor: pointer;
}
.caselist li span {
    display: block;
    line-height: 150%;
    margin-top: 20px;
    font-size: 1.125rem;
    text-align: center;
}