.box {
    width: 100%;
    height: 100%;
    background: url("image/bg.jpg");
    background-size: 100% 100%;
    background-attachment: fixed;
    font-size: 12px;
}
.quan-box {
    width: 20rem;
    height: 20rem;
    border: 1px solid #1EA4E3;
    border-radius: 50%;
}
.box-img {
    width: 80%;
    text-align: center;
}