4.9
从上到下渐变:
#grad { background-image: linear-gradient(#e66465, #9198e5); }
从左到右的线性渐变:
#grad { height: 200px; background-image: linear-gradient(to right, red , yellow); }
从左上角到右下角的线性渐变:
#grad { height: 200px; background-image: linear-gradient(to bottom right, red, yellow); }

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