.preview{position:relative;margin-bottom:20px;}.preview-mask{position:absolute;bottom:0;left:0;right:0;height:100px;}.preview-mask{background-image:-webkit-linear-gradient(top,transparent,#ffffff);background-image:-moz-linear-gradient(top,transparent,#ffffff);background-image:-ms-linear-gradient(top,transparent,#ffffff);background-image:-o-linear-gradient(top,transparent,#ffffff);background-image:linear-gradient(to bottom,transparent,#ffffff);}iframe-consent{height:100%;left:0;position:absolute;top:0;width:100%;}