.btnjmp {
 animation-name:bjp;
 animation-duration:1s;
 animation-iteration-count:infinite;
 /*background:blue;*/
}

@keyframes bjp {
 0% {
  margin-top:0px;
  /*background:red;*/
  background: #272d33;
 }
 50% {
  margin-top:-15px;
  box-shadow:0px 5px 10px #333;
  background:#1a75ff;
 }
}


.btnjmp:hover {
 animation-name:bhop;
 animation-duration:5s;
 animation-iteration-count:infinite;
}
/*
@keyframes bhop {
 0% {
  margin-top:0px;
  background:red;
 }
 50% {
  margin-top:-0px;
  background:blue !important;
 }
 100% {
  margin-top:0px;
  background:red;
 }
}
*/