.square{
    box-sizing: border-box;
    border: 5px solid skyblue;
    min-width: 150px;
    min-height: 150px;
    position: absolute;
    z-index: 10;
    user-select: none;
    background: rgba(255,255,255,0.5);
}
.square:hover{
    cursor: all-scroll;
}
img{
    user-select: none;
}
canvas{
    border: 0.2vw solid black;
}
#mainDiv
{
   margin-top: 2vh; 
}
a{
    background-color: #f44336;
    color: white;
    padding: 14px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
  }