.variable{
 font-weight: bold;
 }
 .background{
 fill: none;
 stroke: #444;
 stroke-width: 1;
 stroke-dasharray: 5, 5;
 }
 .control_line{
 stroke: #28f;
 stroke-width: 0.5;
 }
 .point1{
 fill: #28A86B;
 }
 .point2{
 fill: #6495ED;
 }
 .point3{
 fill: #FF7878;
 }
 .point4{
 fill: #8D5FD3;
 }
 #v48example_shape{
 fill: none;
 stroke: #111;
 stroke-width: 0.8;
 }
 .control_point{
 fill: #FFF;
 opacity: 0;
 stroke: #888;
 stroke-width: 2;
 cursor: pointer;
 }
 .control_point:hover{
 opacity: 0.5;
 }
 .invisible{
 pointer-events: none;
 }