.main-wrapper {
min-width: 320px;
}
.columns-wrapper {
overflow: hidden;
position: relative;
}
.columns-wrapper:after {
clear: both;
content: "";
display: table;
}
.content-with-padding {
margin: 0 auto;
max-width: 800px;
padding: 40px;
position: relative;
}
.full-width-content-with-padding {
padding: 40px;
}
.centered-content {
margin: 0 auto;
max-width: 720px;    
}
.column-three-fourths,
.column-one-half,
.column-one-third,
.column-two-thirds,
.column-one-fourth {
float: left;
position: relative;
}
.column-three-fourths {
width: 75%;
}
.column-two-thirds {
width: 66.6666667%;
}
.column-one-half {
width: 50%;
}
.column-one-third {
width: 33.3333333%;
}
.column-one-fourth {
width: 25%;
}