#rezultat {
  padding: 10px 30px;
  border: none;
  outline: none;
  border-radius: 30px;
  font-size: 1.5rem;
  z-index: 1;
  position: relative;
  -webkit-box-shadow: 0 5px 15px rgba(33, 33, 33, .2);
  box-shadow: 0 5px 15px rgba(33, 33, 33, .2);
  overflow: hidden;
  cursor: pointer;
  bottom: 100%;
  /*margin-left:40%;
  margin-right:40%;*/
  left:40%;
  right:40%;
}

  
#rezultat > span {
    z-index: 2;
  }
  
  #rezultat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 30px;
    background-color: #609966;
    z-index: -1;
    overflow: hidden;
    -webkit-transform: scaleX(0);
    -ms-transform: scaleX(0);
    transform: scaleX(0);
    -webkit-transform-origin: right;
    -ms-transform-origin: right;
    transform-origin: right;
    -webkit-transition: -webkit-transform 0.2s ease-in;
    transition: -webkit-transform 0.2s ease-in;
    transition: transform 0.2s ease-in;
  }
  
  #rezultat:hover {
    color: #e8e8e8;
  }
  
  #rezultat:hover::before {
    -webkit-transform: scaleX(1);
    -ms-transform: scaleX(1);
    transform: scaleX(1);
    -webkit-transform-origin: left;
    -ms-transform-origin: left;
    transform-origin: left;
  }