#chart_container {
    border: 2px solid #CCCCCC;
    border-radius: 5px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.15);

    padding:10px;
}

#chart_container #chart_title {
    text-align:center;
    width: 100px;
    margin-right: auto;
    margin-left: auto;
}