.btn_push {
  transition: transform .1s;
}

.btn_push:active {
  transform: scale(.97);
}

.reflection{
position:relative;
overflow:hidden;
}

.reflection:after {
content:"";
height:100%;
width:40px;
position:absolute;
top:-180px;
left:0;
background-color: #fff;
opacity:0;
-webkit-transform: rotate(45deg);
-webkit-animation: reflection 2s ease-in-out infinite;
}
 
@keyframes reflection {
0% { -webkit-transform: scale(0) rotate(45deg); opacity: 0; }
80% { -webkit-transform: scale(0) rotate(45deg); opacity: 0.5; }
81% { -webkit-transform: scale(4) rotate(45deg); opacity: 1; }
100% { -webkit-transform: scale(50) rotate(45deg); opacity: 0; }
}