.core{
    width: 960px;
    margin: auto;
    height: 350px;
}
.corebusiness{
    width: 30%;
    height: 100%;
    float: left;
    text-align: center;
    line-height: 350px;
    background: #3c7f9f;
    margin-left: 30px;
    font-size: 40px;
    border-radius: 20px;
}