回答編集履歴
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@@ -1,2 +1,91 @@
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ボタンを中心に広がるアニメーション部分のみ作ってみました。
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[コードペン](https://codepen.io/KazuSaka/pen/dyPZLBV)
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[コードペン](https://codepen.io/KazuSaka/pen/dyPZLBV)
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以下コード。
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width">
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<link href="style.css" rel="stylesheet">
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<title>JS Bin</title>
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</head>
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<body>
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<div class="wrap">
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<button id="back-button"></button><!-- ボタンの背後に配置（中心から徐々に大きくする用） -->
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<button id="front-button" onmousedown="down();" onmouseup="up();">change</button>
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</div>
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</body>
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</html>
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<script type="text/javascript">
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var eb = document.getElementById("back-button"); //ボタンの背後
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var ef = document.getElementById("front-button"); //ボタン自体
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var down = function() {
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eb.style.display = "block"; //ボタンの背後の要素を表示
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eb.style.animation = "animation 2s ease";
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ef.style.background = "white";
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ef.style.color = "tomato";
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ef.style.transition = "2s";
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}
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var up = function() {
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eb.style.animation = "animation2 2s ease";
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eb.style.display = "none"; //ボタンの背後を非表示
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ef.style.background = "tomato"; //ボタンの色を戻す
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ef.style.color = "white"; //ボタンの色を戻す
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}
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</script>
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```
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```css
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body {
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width: 100vw;
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height: 100vh;
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}
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.wrap{
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position: relative;
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width: 70px;
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height: 70px;
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}
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button{
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position: absolute;
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top: 0;
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left: 0;
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color: white;
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background: tomato;
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border: none;
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border-radius: 50%;
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width: 70px;
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height: 70px;
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}
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#back-button{
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display: none;
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position: absolute;
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top:50%;
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left:50%;
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transform: translate(-50%, -50%);
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color: black;
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background: red;
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border: none;
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border-radius: 50%;
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width: 5000px;
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height: 5000px;
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padding:0;
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}
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@keyframes animation {
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0% {
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width: 0%;
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height: 0%;
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}
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100% {
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width: 5000px;
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height:5000px;
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}
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}
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```
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