.case-warp {
    margin-top: 100px;
}
.case-warp .title {
    text-align: center;
    font-size: 24px;
}
.case-warp ul {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    margin-top: 50px;
}
.case-warp ul li {
    margin: 4% 3%;
}
.case-warp ul li img {
    width: 100%;
}