.js-sendzeroform { position:relative; display:inline-block; overflow:hidden; cursor:pointer; } .js-sendzeroform::before{ content:""; position:absolute; inset:0; background:#505050; transform:scaleY(0); transform-origin:bottom; transition:transform .4s ease; pointer-events:none; z-index:0; /* не блокирует клик */ } .js-sendzeroform:hover::before{ transform:scaleY(1); }