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I'm creating a menu bar on my website. My issue is that there is a small margin at the side of one of my menu items. (I have highlighted this by adding background-color: black; to the container.) I am using safari.

margin issue

The CSS:

.testMenuOption{
  width: calc(100%  /3);
  height: 100%;
  float: left;
  margin:auto;
  background-color: white;
  display: table;
}

Can somebody tell me what my issue is? I have tried removing the text and it is not the issue.

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2 Answers 2

Reset to default
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Since you calculate the width by using 100/3, there will be rounding errors, where as a result the widths wont add up 100% again. What you can do to fix it is to set the width of two of the .menuOptionsWraps to 33% and one to 34%.

For example by doing so:

.menuOptionSelectedWrap {
    float: left;
    width: 33%;
    height: 100%;
    margin: auto;
    margin-right: -4px;
    background-color: #d6eef2;
    display: table;
}
.menuOptionSelectedWrap:last-of-type {
    width: 34%;
}
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  • 1
    width: 33.33333333% should work as well, Bootstrap does that for example.
    – AlexG
    Commented Aug 2, 2016 at 11:34
  • Surely 33.33333333% is never going to be completely accurate?
    – x3nr0s
    Commented Aug 2, 2016 at 11:38
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    That depends on the total size of the container. If the remaining 0.0000001% of space is less then what it takes the browser to render it as a pixel, i shouldn't be visible. But you can probably already guess how absurdely big such a container must be to render that pixel.
    – Fabian S
    Commented Aug 2, 2016 at 11:43
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I'm not sure what you say,that black line change when window resize.check your css, width: calc(100% /3); change the value 3,you will get idea.

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