.topmenu {
height: auto;
width: auto;
background-color: #00FFFF;
//display: inline-block;
border-radius: 10px;
margin: 10px 10px;
padding: 10px 20px;
border: 2px solid red;
}

.center {
  margin: auto;
  width: 510px;
  border: 3px solid green;
  padding: 10px;
}

.consarea {
height:300px;
width:300px;
background-color: #F0FFFF;
border-radius: 5%;
border: 2px solid lightblue;
margin: auto;
transition: background-color 0.5s
}

.drawingarea {
height:250px;
width:500px;
background-color: #F0FFFF;
border-radius: 5%;
border: 2px solid red;
margin: auto;
transition: background-color 0.5s
}