html {background-color:#782882;}

.box {
     position: absolute;
     top: 50%;
     left: 50%;
     width: 700px;
     height: 710px;
     padding: 0px;
     margin-left: -350px;
     margin-top: -355px;
     background: transparent;
     box-sizing: border-box;
}
.box img {width:100%;}