JSFiddle - React, Tailwind, and code Playground

HTML

<div class="submit">
  <button type="submit" class="button-blue hvr-shutter-out-horizontal" onclick="upisnik();">OVDJE</button>
</div>

CSS

.button-blue {
  font-family: 'Montserrat', Arial, Helvetica, sans-serif;
  display: block;
  width: 100px;
  height: 35px;
  border: #fbfbfb solid 4px;
  cursor: pointer;
  background: #3498db;
  color: white;
  font-size: 12px;
  padding-top: 8px;
  padding-bottom: 12px;
  margin-left: auto;
  margin-right: auto;
  font-weight: 700;
}

.submit {
  display: inline;
  text-align: center;
  height: 35px;
}

.hvr-shutter-out-horizontal {
  display: block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  background: #3498db;
  -webkit-transition-property: color;
  transition-property: color;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
}

.hvr-shutter-out-horizontal:before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: #fbfbfb;
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  -webkit-transform-origin: 50%;
  transform-origin: 50%;
  -webkit-transition-property: transform;
  transition-property: transform;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-out;
  transition-timing-function: ease-out;
}

.hvr-shutter-out-horizontal:hover,
.hvr-shutter-out-horizontal:focus,
.hvr-shutter-out-horizontal:active {
  color: #3498db;
}

.hvr-shutter-out-horizontal:hover:before,
.hvr-shutter-out-horizontal:focus:before,
.hvr-shutter-out-horizontal:active:before {
  -webkit-transform: scaleX(1);
  transform: scaleX(1);
}