宽度取决于标志图像的大小，而高度可以随意按像素大小设置。
The width depends on the size of the banner image and the height is arbitrarily set to a number of pixels.
不要使用比您需要，只是因为您可以在HTML中设置宽度和高度的一大图像。
Don't use a bigger image than you need just because you can set the width and height in HTML. If you need.
图像的高度和宽度的最大值被设置为 150 像素，但是保持高宽比例不变，因此图像没有变形。
The height and width are maxed out at 150 pixels, but the ratio of the height-to-width is preserved so the images are not distorted.
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