Centering Things!

center.scss

.overlay{
 position: relative; 
 img#float-logo{
     	display: block;
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%) 
        -webkit-transform: translate(-50%, -50%);
       -moz-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
         -o-transform: translate(-50%, -50%);
 }
}