#section7 .content .r_block .box:before {
content: '';
display: inline-block;
width: 30px;
height: 30px;
position: absolute;
left: 0;
top: 50%;
margin-top: -15px;
background-image: url(../img/);
background-position: center;
background-repeat: no-repeat;
background-size: contain;
}