img {
    border: solid #ccc 1px;
}

.annotation {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #e53935;
    color: white;
    font: bold 12px/18px sans-serif;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.4);
    border: 2px solid white;
    position: relative;
    top: -1px;
}