@media screen and (max-width: 1000px)
{
	.left_column, .right_column {
		width: 90%;
		margin-left: 5%;
		margin-right: 5%;
	}
}

@media screen and (max-width: 700px)
{
	.left_column, .right_column {
		width: 100%;
		margin-left: 0;
		margin-right: 0;
	}
}

@media screen and (min-width: 1500px)
{
	.container {
		margin-left: calc(50% - 750px);
	}
}