<!--

.btn04{
        color: #000;
        text-decoration: none;
        text-align: center;
        position: relative;
        z-index: 10;
        display : block;
        width: 160px;
        height: 160px;
        line-height: 160px;
    
  margin-left : auto;
  margin-right : auto;
  margin-top : 20px;
  margin-bottom : 20px;
}

    .btn04::before {
        content: '';
        background-color: #fff;
        display: block;
        position: absolute;
        width: 160px;
        height: 160px;
        z-index: -1;
        border-radius: 50%;
        box-shadow:
            0 0 0 0 #fff,
            0 0 0 0 #dda284;
        transition: all .2s ease;
        -webkit-transition: all .2s ease;
    }
    .btn04:hover::before {
        transform: scale(0.8);
        -webkit-transform: scale(0.8);
        box-shadow:
            0 0 0 25px #000,
            0 0 0 25px #dda284;
    }
-->