CSS snippet for a fluid responsive 3 column layout.

  1. 1/3 + 1/3 + 1/3
  2. 1/2 + 1/4 + 1/4
  3. 1/4 + 1/2 + 1/4
  4. 1/4 + 1/4 + 1/2

1/3 + 1/3 + 1/3 responsive 3 column layout

Three Column Layout with equal width content

HTML
CSS
.col-one, .col-two, .col-three {
    width: 30%;
    float: left;
    margin-right: 5%
}

.col-three {
    margin-right: 0;
}

.clear {
    clear: both;
}
Responsive CSS
@media screen and (max-width : 767px) {
    .col-one, .col-two, .col-three {
        width: 100%;
        float: none;
        margin: 0;
    }

    .col-one, .col-two {
        padding-bottom: 30px;
    }
}

1/2 + 1/4 + 1/4 responsive 3 column layout

Three Column Layout with 1/2 + 1/4 + 1/4 layout

HTML
CSS
.col-one {
	float: left;
	width: 48%;
	margin-right: 2%;
}

.col-two, .col-three {
	float: left;
	width: 24%;
	margin-right: 2%;
}			

.col-three {
	margin-right: 0;
}

.clear {
    clear: both;
}
Responsive CSS
@media screen and (max-width : 767px) {
    .col-one, .col-two, .col-three {
        width: 100%;
        float: none;
        margin: 0;
    }

    .col-one, .col-two {
        padding-bottom: 30px;
    }
}

1/4 + 1/2 + 1/4 responsive 3 column layout

Three Column Layout with 1/4 + 1/2 + 1/4 responsive 3 column layout layout

HTML
CSS
.col-one, .col-three {
	float: left;
	width: 24%;
	margin-right: 2%;
}

.col-two {
	float: left;
	width: 48%;
	margin-right: 2%;
}			

.col-three {
	margin-right: 0;
}

.clear {
    clear: both;
}
Responsive CSS
@media screen and (max-width : 767px) {
    .col-one, .col-two, .col-three {
        width: 100%;
        float: none;
        margin: 0;
    }

    .col-one, .col-two {
        padding-bottom: 30px;
    }
}

1/4 + 1/4 + 1/2 responsive 3 column layout

Three Column Layout with 1/4 + 1/4 + 1/2 layout

HTML
CSS
.col-one, .col-two {
	float: left;
	width: 24%;
	margin-right: 2%;
}

.col-three {
	float: left;
	width: 48%;
	margin-right: 0;
}

.clear {
    clear: both;
}
Responsive CSS
@media screen and (max-width : 767px) {
    .col-left, .col-right {
        width: 100%;
        float: none;
    }

    .col-left {
        padding-bottom: 30px;
    }
}
Note
@media screen and (max-width : 767px) {

767px is the viewport width, i.e. the width of the screen or the browser viewport. 768px is the portrait width of iPad 2, so anything under that is mostly considered as mobile viewport, if you wish to make the responsive css trigger before, change 767px to something higher

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