What should I do if the css border cannot be displayed?

The solution to the problem that the css border cannot be displayed: first open the corresponding HTML code file; then find the border code part; 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, the border display may not be fully displayed, not all the top, bottom, left and right, or the border may not be displayed,

width: 100% If the border exceeds 100%,

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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