How to make a background using CSS gradient with flat color?

Question

A backgrond like this with same height of red and yellow.

Answer 1

Using Colorzilla's gradient generator, just set two colors to the same % location and you'll get a hard edge between the two colors.

background: #ffff00; /* Old browsers */
background: -moz-linear-gradient(top, #ffff00 30%, #ffff00 30%, #fe0000 30%); /*  FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(30%,#ffff00), color-stop(30%,#ffff00), color-stop(30%,#fe0000)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, #ffff00 30%,#ffff00 30%,#fe0000 30%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, #ffff00 30%,#ffff00 30%,#fe0000 30%); /* Opera11.10+ */
background: -ms-linear-gradient(top, #ffff00 30%,#ffff00 30%,#fe0000 30%); /* IE10+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffff00', endColorstr='#fe0000',GradientType=0 ); /* IE6-9 */
background: linear-gradient(top, #ffff00 30%,#ffff00 30%,#fe0000 30%); /* W3C */