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The solution to the problem that the css border is not displayed: first open the corresponding code file; then find the code part where the border is not displayed; and finally reset the width or add "box-sizing".
The operating environment of this article: Windows7 system, HTML5&&CSS3 version, Dell G3 computer.
css has written that the border display is incomplete or not displayed
div{ width: 100%; border: solid 5px green; }
At this time, it may be that the border display is incomplete and the upper, lower, left and right are not displayed, or the border is not displayed,
width: 100% border exceeds 100%,
Need to reset the width or add box-sizing.
Width 100% does not include margin, border and padding
Other reasons have not been discovered yet.
div{ width:97%; border: solid 5px green; }
【Recommended learning:css video tutorial】
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