.maincontainer{
width: 400px; /*Width of main container*/
margin: 0 auto; /*Center container on page*/
overflow: hidden; 
}
.maincontainer img {
border: 0;
}
.envoltura{
float: left;
width: 100%;
}
.rigthcolumn{
margin-left: 200px; /*Set left margin to LeftColumnWidth*/
}
.leftcolumn{
float: left;
width: 200px; /*Width of left column*/
margin-left: -400px; /*Set left margin to -(MainContainerWidth)*/
}
.envoltura2{
float: left;
width: 100%;
}
.rigthcolumn2{
margin-left: 200px; /*Set left margin to LeftColumnWidth*/
}
.leftcolumn2{
float: left;
width: 200px; /*Width of left column*/
margin-left: -400px; /*Set left margin to -(MainContainerWidth)*/
}
.abc {
text-align: center;
font-weight: bold ;
}
.innertube{
margin: 5px; /*Margins for inner DIV inside each column (to provide padding)*/
margin-top: 0;
}