如何在没有文字的情况下制作完整的背景图像电子邮件？

Question

我想知道即使没有文字，如何在电子邮件中使背景显示为全宽。即使没有你能看到的文字和它的真实尺寸，我也不知道如何让它出现。我希望结果与此类似，底部的文本就像一个页脚。有人知道怎么做吗？

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