.contain{
  margin: 30px;
}

.back-main{
  background: #75dd52 no-repeat; /* Old browsers */
  background: -moz-linear-gradient(-45deg, #75dd52 0%, #416bb5 100%) no-repeat; /* FF3.6-15 */
  background: -webkit-linear-gradient(-45deg, #75dd52 0%,#416bb5 100%) no-repeat; /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(135deg, #75dd52 0%,#416bb5 100%) no-repeat; /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#75dd52', endColorstr='#416bb5',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
  background-size: 2400px 1280px;
}