/* リセット用のCSS。ブラウザ間の差を無くす*/
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W3", メイリオ, Meiryo, "ＭＳ Ｐゴシック", "Helvetica Neue", Helvetica, Arial, sans-serif;

    text-align: center;
}

.flex-container {
    display: flex;
    flex-direction: row;
    justify-content: center;
}

.bg-gray {
    background-color: #dddddd;
}

.btn {
    color: #000;
    background-color: #fff;
    border-radius: 100vh;
    text-decoration:none;
    border: solid 2px silver;
    padding:5px 10px;
}