body {
  font-family: Arial;
}
.btn-a::after {
  content:'Visit Right PDF.com';
  display:block;
  position: absolute;
  bottom:0;
  font-size:26px;
  color:#13a550;
  left:11%;
  font-weight: bold;
}
.btn-b::after {
  content:'Buy Right PDF';
  display:block;
  position: absolute;
  bottom:0;
  font-size:26px;
  color:#1cbfbd;
  left:22%;
  font-weight: bold;
}
.btn-c::after {
  content:'Get Support';
  display:block;
  position: absolute;
  bottom:0;
  font-size:26px;
  color:#005757;
  left:25%;
  font-weight: bold;
}

@media screen and (min-width:200px) and (max-width:767px) {
  .btn-a::after { left:5%;}
  .btn-b::after { left:18%;}
  .btn-c::after { left:17%;}
}