.mySidenav a {
  position: absolute;
  right: -50px;
  transition: 0.3s;
  padding: 5px;
  width: 120px;
  text-decoration: none;
  font-size: 20px;
  color: white;
  border-radius: 5px 0 0 5px;
}
.mySidenav a:hover
{
  right:0;
}

.about 
{
    position:fixed;
    background-color:#f44336;
}