div.custom-chart {
    position:relative;
    width:60px; 
    height:60px;
    display: block;
    margin: 0 auto;
}
.custom-chart canvas {
    display: block;
    position:absolute;
    top:0;
    left:0;
}
.custom-chart span {
    color:#555;
    display:block;
    line-height:60px;
    text-align:center;
    width:60px;
    font-size:18px;
    font-weight:600;
    margin-left:2px;
}