html, body {
  margin: 0;
  padding: 0;
  height: 600px;
}

canvas {
  display: block;
}

.btn {
            color: white;
            background-color: #38CC77;
            height: 40px;
            width: 90px;
            padding: 2px;
            border: 2px solid black;
            text-decoration: none;
            display: inline-block;
            margin: 0 10px;
            text-align: center;
        }

#box1 {
  padding: 10px;
  border:2px solid black;
  
}


#Div1 {
  width: 250px;
  border: 0px solid grey;
  height: auto;
  background-color: rgb(250, 248, 248);
}

#StirlingSum {
  background-color: aqua;
}
#BellTriangle {
  background-color: aqua;
}
#BellRecur {
  background-color: aqua;
}