crm/public/static/css/material.css

div.sharephone{
    display: block;
    width: 74%;
    padding: 30px 0;
    text-align: center;
    font-size: 14px;
    background-color: #fff;
    border-radius: 6px;
    box-shadow: 0 0 20px -2px rgba(0, 0, 0, 0.3);
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 999;
    transform: translateX(-50%) translateY(-50%);
}
div.sharephone img.close_icon{
    display: block;
    width: 20px;
    position: absolute;
    top: 4px;
    right: 4px;
    z-index: 9;
}
button.copyphone{
    display: block;
    width: auto;
    padding: 0 16px;
    background-color: #249efb;
    color: #fff;
    margin: 20px auto 0;
    font-size: 14px;
    height: 32px;
    line-height: 32px;
    border: unset;
    border-radius: 4px;
}