#canvas-container{
    position: relative;
    /*height: 0;*/
    overflow: hidden;
    /*padding-top: 70%;*/
    max-width: 500px;
    height: 400px;
    margin-left: auto;
    margin-right: auto;
}
#myCanvas{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: auto;
    max-width: 1000px;
    background-image: url(../images/back.png);
    background-size:auto 100%;
}

@media screen and (max-width: 450px){
  html , body{
    width: 100%;
    height: 100%;
    margin: 0;
  }

  #canvas-container{
    padding: 0;
    height: 100%;
    margin: 0;
    max-height: 100%;
  }
  #myCanvas{
    background-image: url(../images/back2.png);
    background-size:auto 100%;
    background-position: center center;
    background-repeat: no-repeat;
  }
}


#back-home {
	left: 25%;
  margin: 10px auto 20px;
  width: 680px;
  background: transparent url("../images/sen.png") top center no-repeat;
}
#back-home p {
  background: transparent url("../images/back-o.png") left center no-repeat;
  background-size: 32px;
  line-height: 60px;
  padding-left: 40px;
  display: flex;
  justify-content: space-between;
}
@media (max-width: 480px) {
  #back-home {
    display: none;
  }
}