.sub{padding-top:80px}.sub header{background-color:#fff}.sub header:not(.sticky)::after{content:"";display:block;width:100%;height:15px;position:absolute;bottom:-15px;left:0;background-image:linear-gradient(to bottom, rgba(0, 0, 0, 0.15) 0%, rgba(0, 0, 0, 0) 100%);background-repeat:repeat-x;filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#26000000', endColorstr='#00000000', GradientType=0)}.sub section.text{background-color:#f0f7fa}section .sticky{position:sticky;top:140px}