现在在水彩图层之上再新建一个图层，然后从下至上从黑色到透明做线性递减绘制，这样基本上整个画布到底部就褪化为黑色了。
Now in a new layer above the watercolor layer, and drawing straight up, make a Linear Gradient going from black to transparency so that afterwards your canvas basically fades to black down the bottom.
在画布中点击任何地方然后把图层拖到你需要复制到的新建文件里。
Click anywhere in the canvas and drag the layers up to the TAB of the document you want to copy the layers to.
现在在画布上添加参考线，以确保正确对齐的各种网页布局的组件。您可以精确的创建参考线，点击： 查看> 新建参考线。
Now add guides on the canvas in order to ensure proper alignment of the various web layout components. You can create guides accurately by going to View > New Guide.
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