.preview { position: relative; width:100%; -webkit-border-radius: 10px;-moz-border-radius: 10px; border-radius: 10px; cursor: pointer;}
#canvas-preview{ width: 220px; top: 70px; position: relative;}
.preview_textfield{position: absolute; top: 40%; left: 0; right: 0; text-align: center; font-size: 2em; color: black; }
.donut #preview-textfield{ top: 110px; font-size: 1.3em;}
.donut #opts-donut{ display: block;}
.gauge #opts-gauge{ display: block;}
#opts-gauge, #opts-donut{ display: none;}