html, body{
  /* width:100%; */
  /* height:100%; */
  /* overflow:hidden; */
  margin:10px;   
}
img {
  float: right;
}
img.nofloat {
  float: none;
}
#mycanvas {
	width:  400px;
	height: 400px;
	border: 1px solid black;
	background-color: white;
}
td.output-cell {
  display: flex;
  flex-direction: column;
  max-width: 100%;
  min-width: 200px;
}
.CodeMirror {
  border: 1px solid #ccc;
  height: 200px;
  font-size: 1.1em;
  min-width: 400px;
  max-width: 800px;
  width: 100%;
  box-sizing: border-box;
}
  #output {
  margin: 0;
  padding: 10px;
  line-height: normal;
  height: 200px;
  width: 350px;
  max-width: 100%; 
  overflow-y: auto;
  overflow-x: auto;
  white-space: pre;
  background-color: #f9f9f9;
  border: 1px solid #ccc;
  box-sizing: border-box;
  flex-grow: 1;
  font-size: 1.1em;
}
textarea {
  width: 100%;
}
button {
  margin-top: 10px;
}

#yourcode {
  min-width: 400px;
  max-width: 800px;
  width: 100%;
  box-sizing: border-box;
}