Как сделать кнопку с анимацией?

.callback_1 {
    width: 179px;
    margin: auto;
    margin-top: 20px;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
    overflow: hidden;
    padding: 8px 25px;
    background: #008bd4;
    box-shadow: 0 0 23px rgba(0, 139, 212, 0.46);
}
 
.callback_1:before {    
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: -12px;
    background: #008bd4;
    background: linear-gradient(to right, #008bd4 0%, #33c1f9 100%);
    -webkit-transform: skew(-35deg) translateX(0);
    transform: skew(-35deg) translateX(0);
    -webkit-transition: all .4s ease-out;
    transition: all .4s ease-out;
    z-index: -3;
 
 
}
 
.callback_1:after {
    content: "";
    position: absolute;
    width: 75%;
    height: 100%;
    top: 0;
    right: -12px;
    background: #33c1f9;
    background: linear-gradient(to right, #33c1f9 0%, #008bd4 100%);
    -webkit-transform: skew(-35deg) translateX(100%);
    transform: skew(-35deg) translateX(0);
    -webkit-transition: all .4s ease-out;
    transition: all .4s ease-out;
    z-index: -2;
        animation-duration: 5s;
    animation-fill-mode: both;
    animation-iteration-count: infinite;
}