<div class="button05">ボタン05</div>
.button05 {
overflow: hidden;
position: relative;
background: #313131;
color: #fff;
}
.button05:before {
content: "";
width: 20px;
height: 100px;
transform: rotate(30deg);
background-color: rgba(255, 255, 255, 0.5);
box-shadow: 0 0 3px #fff;
position: absolute;
top: -10px;
left: 0;
animation: btn05 1.5s ease-in-out infinite;
}
@keyframes btn05 {
0% {
left: -50px;
}
0% {
left: 130%;
}
100% {
left: 130%;
}
}