问题
I need to apply a white to transparent gradient which covers about a 1/4 of the top of the page and a background image visible for the rest of the page.
Im looking to achieve a seamless blend from a gradient to a textured image and to do this in CSS3.
回答1:
I recommend Ultimate CSS Gradient Generator - ColorZilla.com
It's a well designed tool and there's a white to transparent preset.
The CSS code that it generates for a white to transparent gradient is this:
background: -moz-linear-gradient(top, rgba(255,255,255,1) 0%, rgba(255,255,255,0) 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(top, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(to bottom, rgba(255,255,255,1) 0%,rgba(255,255,255,0) 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#00ffffff',GradientType=0 ); /* IE6-9 */
回答2:
I prefer to use another tool for gradients generation - EnjoyCSS. It also allows to generate other CSS features like background, shadows, transitions etc.
White to transparent gradient generated with this tool:
background-image: -webkit-linear-gradient(-90deg, rgba(255,255,255,0) 0, rgba(255,255,255,1) 100%);
background-image: -moz-linear-gradient(180deg, rgba(255,255,255,0) 0, rgba(255,255,255,1) 100%);
background-image: linear-gradient(180deg, rgba(255,255,255,0) 0, rgba(255,255,255,1) 100%);
background-position: 50% 50%;
-webkit-background-origin: padding-box;
background-origin: padding-box;
-webkit-background-clip: border-box;
background-clip: border-box;
-webkit-background-size: auto auto;
background-size: auto auto;
来源：https://stackoverflow.com/questions/6397712/white-to-transparent-gradient-with-background-image