body{
  text-align: center;
}

#background{
  background-image: linear-gradient(to right top, #d16ba5, #c777b9, #ba83ca, #aa8fd8, #9a9ae1, #8aa7ec, #79b3f4, #69bff8, #52cffe, #41dfff, #46eefa, #5ffbf1);
}

#canvas{
  background-color: white;
  width: 100%;
}

.box {
  background-color: #F0F0F0;
}

input{
  max-width: 80px;
  min-width: 48px;
}

h4{
  margin-left: auto;
  margin-right: auto;
}

.tall{
  height:100%;
}