<header><h3>Шапка</h3>&nbsp;<p>(наведи курсор)</p></header>
<main><h3>Тело</h3>&nbsp;<p>(наведи курсор)</p></main>
<footer><h3>Тапки</h3>&nbsp;<p>(наведи курсор)</p></footer><hr color=#990;>
<a href="https://toster.ru/q/670534" target="_blank">Тостер</a>
header, main, footer
{ display: flex;
  width: 99%;
  height: auto;
  margin: 1px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid #0aa;
  background: #ddd
}
header:hover ~ footer {display:none}
main:hover ~ footer {visibility: hidden;}
footer:hover {opacity:.5;}

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