【HTML・CSS】アイコン付きボタン【便利帳】

<a class="btn btn_icon" href="">ボタン</a>

    .btn_icon{
        position: relative;
    }
    .btn_icon:after{
        content: "";
        display: flex;
        align-items: center;
        width: 20px;
        height: 20px;
        margin-left: 5px;
        background-image: url(flower.jpg);
        background-size: contain;
        background-repeat: no-repeat;
    }

<a class="btn " href="">ボタン<span class="icon"><img src="flower.svg"></span></a>

    .btn{
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        align-items: center;
        font-size: 14px;
        border: 1px solid #666;
        text-align: center;
        color: #666;
        box-sizing: border-box;
        text-decoration: none;
        max-width: 200px;
        width: 100%;
        height: 100%;
        margin: 20px auto;
        padding: 10px;
    }
    .btn span{margin-left: 5px;}
    .btn .icon img{
        width: 20px;
        height: auto;
    }