@property --stack-top{syntax:"<length>";inherits:false;initial-value:0}.landing .stack-base{top:var(--stack-top,0px);z-index:1;position:sticky}.landing .stack-base[data-covered="1"]{visibility:hidden}.landing .stack-base~section{z-index:2;position:relative}.landing .stack-over{border-top-left-radius:2.5rem;border-top-right-radius:2.5rem}