LPなどで使用されるお申し込みボタンを、キラッと光が右に流れ、上下に揺れるアニメーションで実装！レイアウトとソースコードを紹介！

<div class="btn-center glitter updown">
	<a href="#" class="btn-link">
		今すぐ無料体験に申し込む！
		<span class="icon-right"></span>
	</a>
</div>

.btn-center {
    text-align: center;
}
.btn-link {
    position: relative;
    display: inline-block;
    width: 100%;
    max-width: 640px;
    line-height: 130px;
    font-size: 30px;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-align: center;
    color: #fff;
    background: linear-gradient(to top, #66C538, #93D367);
    border-radius: 100px;
    box-shadow: 0 8px 8px rgba(0, 0, 0 ,0.4);
}

.glitter {
    position: relative;
    width: 100%;
    display: inline-block;
    overflow: hidden;
    padding-bottom: 16px;
}
.glitter::before {
    content: "";
    position: absolute;
    top: 0;
    left: -25%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 100%);
    transform: skewX(-25deg);
    animation: glitterFlow 2s infinite;
    z-index: 1;
}
@keyframes glitterFlow {
    0% {
        left: -25%;
    }
    50% {
        left: 120%;
    }
    100% {
        left: 125%;
    }
}

.updown {
    animation: updown 3s ease-in-out infinite;
}
@keyframes updown {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
    100% {
        transform: translateY(0);
    }
}

.icon-right::before {
    content: "";
    position: absolute;
    top: 50%;
    right: 10px;
    width: 6px;
    height: 6px;
    border-top: 2px solid currentColor;
    border-right: 2px solid currentColor;
    transform: translate(-65%,-50%) rotate(45deg);
}

@media screen and (min-width: 768px) {
    .btn-link {
        line-height: 130px;
        font-size: 30px;
    }
    .icon-right::before {
        right: 30px;
        width: 20px;
        height: 20px;
        border-top: 3px solid currentColor;
        border-right: 3px solid currentColor;
    }
}
@media screen and (max-width: 767px) {
    .btn-link {
        width: calc(100% - 20px);
        line-height: 80px;
        font-size: 18px;
    }
    .icon-right::before {
        right: 10px;
        width: 12px;
        height: 12px;
        border-top: 2px solid currentColor;
        border-right: 2px solid currentColor;
    }
}