* {
    margin: 0;
    padding: 0;
    border: 0
}
body {
    
}

.container {
    background-image: url("background.png");
    background-repeat: no-repeat;
    background-size: 100%;
    display: table;
    height: 100%;
    position: absolute;
    overflow: hidden;
    width: 100%;
}
.helper {
    #position: absolute;
    #top: 50%;
    display: table-cell;
    vertical-align: middle;
}
.content {
    #position: relative;
    #top: -50%;
    margin: 0 auto;
    text-align: center;
}

@media(max-width: 780px) {
  .container {
    background-size: 120%;
  }
}
  
@media(max-width: 430px) {
  .container {
    background-size: 150%;
  }
}