#sert-top-block a {
  background: #026869; color: white; padding: 20px 60px; font-size: 34px; border-radius: 15px; margin-top: 100px; display: inline-block;
    box-shadow: 10px 10px 10px #0000009e; border: solid 2px white; text-shadow: 3px 3px 7px black;
  transition: .5s;
}
#sert-top-block a:hover {
  transition: .5s;
  background: #03a9ab;
  font-size: 34px;
  border-radius: 15px;
  box-shadow: 1px 1px 10px #0000009e;
  border: solid 1px white;
}