.parent {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    overflow: auto;
}

.block {
    text-align:center;
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -125px 0 0 -125px;
}
.ramka {
    border-style: dashed;
    padding: 10px;
    margin: 10px;
    border-radius: 20px;
    border-color:blue;
}

a.button24 {
  display: inline-block;
  color: white;
  text-decoration: none;
  padding: .5em 2em;
  outline: none;
  border-width: 2px 0;
  border-style: solid none;
  border-color: #FDBE33 #000 #D77206;
  border-radius: 6px;
  background: linear-gradient(#F3AE0F, #E38916) #E38916;
  transition: 0.2s;
} 
a.button24:hover { background: linear-gradient(#f5ae00, #f59500) #f5ae00; }
a.button24:active { background: linear-gradient(#f59500, #f5ae00) #f59500; }