* {box-sizing: border-box;}

.foot {
  overflow: hidden;
  padding: 20px 10px;
  position:fixed;
  bottom:0px;
}

.center {
  float: none;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-size: 18px; 
  line-height: 25px;
  border-radius: 4px;
}