.protypefeedback.sendbox{position: relative;}
.protypefeedback.sendbox:before{content:'';width:100vw;max-width:2560px;height:100%;display:block;background: #F8F8F8;position: absolute;top:0;left:50%;transform: translateX(-50%);z-index:2;}
.protypefeedback.sendbox>*{z-index:2;position: relative;}