html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  overflow-y: scroll;
}

.container {
  width: 100%;
  height: 100%;
  background-image: url('images/bg.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.top{
  width: 45%;
  margin: 0 auto;
  padding-top: 5%;
}
.top img{
  width: 100%;
  height: auto;
}

.center{
  width: 86%;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  margin-top: 5%;
}

.center .demo{
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.center .right{
  width: 130px;
  height: auto;
  object-fit: contain;
  position: absolute;
  right: -30px;
  top: -20px;
}

.bottom{
  width: 35%;
  margin: 0 auto;
  margin-top:20px;
}
.bottom img{
  width: 100%;
  height: auto;
}