.about-middle{
    background: url(../images/about_bg.jpg) no-repeat center /cover;
    color: #fff;
    padding: 1rem 0 1.1rem;
}
.about-middle .p{max-width: 550px;margin: 0 auto;}
.contact-button a{
    width: 1.32rem;
    height: 1.32rem;
    border-radius: 50%;
    border: none;
    outline: none;
    background: var(--theme-color) url(../images/icons/icon_rt4.png) no-repeat center 25% / 13px;
    color: white;
    font-size: .2rem;
    cursor: pointer;
}
.contact-button a:hover{
    box-shadow: 0 0 30px 1px #7e7e7e;
}