hover include border bottom in css?

Question

I have a active class that I applied border

.tabs-nav .tab-active a {
  border-bottom: 3px solid red;
  cursor: default;
}

But the problem is the border looks like it's outside the box when I hover, how to make it inside? means I want a straight line for the tab items with active border.

demo https://jsfiddle.net/eztskazd/

Answer 1

This is what You want? Just replace your entire css with below and check:

ul,
li,
div {
  background: hsla(0, 0%, 0%, 0);
  border: 0;
  font-size: 100%;
  margin: 0;
  outline: 0;
  padding: 0;
  vertical-align: baseline;
  font: 13px/20px "Droid Sans", Arial, "Helvetica Neue", "Lucida Grande", sans-serif;
  text-shadow: 0 1px 0 hsl(0, 100%, 100%);
}

li {
  display: list-item;
  text-align: -webkit-match-parent;
}

.tabs-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tabs-nav li:first-child a {
  border-right: 0;
}

a:hover {
  background: #eee;
  border-bottom: 3px solid red;
  cursor: default;

}

.tabs-nav a {
  background: hsl(120, 11%, 96%);
  color: hsl(215, 6%, 57%);
  display: block;
  font-size: 11px;
  font-weight: bold;
  height: 40px;
  line-height: 44px;
  text-align: center;
  text-transform: uppercase;
  width: 140px;
}

.tabs-nav li {
  float: left;
}

.tabs-stage {
  border: 1px solid hsl(210, 6%, 79%);
  -webkit-border-radius: 0 0 6px 6px;
  -moz-border-radius: 0 0 6px 6px;
  -ms-border-radius: 0 0 6px 6px;
  -o-border-radius: 0 0 6px 6px;
  border-radius: 0 0 6px 6px;
  border-top: 0;
  clear: both;
  margin-bottom: 20px;
  position: relative;
  top: -1px;
  width: 281px;
}

.tabs-stage p {
  margin: 0;
  padding: 20px;
  color: hsl(0, 0%, 33%);
}

Answer 2

Use box-sizing: border-box

From W3schools on the border-box value of box-sizing:

The width and height properties (and min/max properties) includes content, padding and border

.tabs-nav .tab-active a {
  border-bottom: 3px solid red;
  box-sizing: border-box;
  cursor: default;
}

https://jsfiddle.net/eztskazd/10/

Answer 3

You will need to set the box-sizing:border-box to the element to tell that any padding and border values to the element will be included to the element width and height.

// From http://learn.shayhowe.com/advanced-html-css/jquery

// Change tab class and display content
$('.tabs-nav a').on('click', function(event) {
  event.preventDefault();

  $('.tab-active').removeClass('tab-active');
  $(this).parent().addClass('tab-active');
  $('.tabs-stage div').hide();
  $($(this).attr('href')).show();
});

$('.tabs-nav a:first').trigger('click'); // Default

* {
  box-sizing: border-box;
}

ul,
li,
div {
  background: hsla(0, 0%, 0%, 0);
  border: 0;
  font-size: 100%;
  margin: 0;
  outline: 0;
  padding: 0;
  vertical-align: baseline;
  font: 13px/20px "Droid Sans", Arial, "Helvetica Neue", "Lucida Grande", sans-serif;
  text-shadow: 0 1px 0 hsl(0, 100%, 100%);
}

li {
  display: list-item;
  text-align: -webkit-match-parent;
}

.tabs-nav li :hover {
  background: #eee;
}

.tabs-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tabs-nav li:first-child a {
  border-right: 0;
}

.tabs-nav .tab-active a {
  border-bottom: 3px solid red;
  cursor: default;
}

.tabs-nav a {
  background: hsl(120, 11%, 96%);
  color: hsl(215, 6%, 57%);
  display: block;
  font-size: 11px;
  font-weight: bold;
  height: 40px;
  line-height: 44px;
  text-align: center;
  text-transform: uppercase;
  width: 140px;
}

.tabs-nav li {
  float: left;
}

.tabs-stage {
  border: 1px solid hsl(210, 6%, 79%);
  -webkit-border-radius: 0 0 6px 6px;
  -moz-border-radius: 0 0 6px 6px;
  -ms-border-radius: 0 0 6px 6px;
  -o-border-radius: 0 0 6px 6px;
  border-radius: 0 0 6px 6px;
  border-top: 0;
  clear: both;
  margin-bottom: 20px;
  position: relative;
  top: -1px;
  width: 281px;
}

.tabs-stage p {
  margin: 0;
  padding: 20px;
  color: hsl(0, 0%, 33%);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="tabs-nav">
  <li class=""><a href="#tab-1" rel="nofollow">Features</a>
  </li>
  <li class="tab-active"><a href="#tab-2" rel="nofollow">Details</a>
  </li>
</ul>
<div class="tabs-stage">
  <div id="tab-1" style="display: none;">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus nec neque nisi, dictum aliquet lectus.</p>
  </div>
  <div id="tab-2" style="display: block;">
    <p>Phasellus pharetra aliquet viverra. Donec scelerisque tincidunt diam, eu fringilla urna auctor at.</p>
  </div>
</div>

Or you can apply the border by default to the a same as background color and change that color on .active state

// From http://learn.shayhowe.com/advanced-html-css/jquery

// Change tab class and display content
$('.tabs-nav a').on('click', function(event) {
  event.preventDefault();

  $('.tab-active').removeClass('tab-active');
  $(this).parent().addClass('tab-active');
  $('.tabs-stage div').hide();
  $($(this).attr('href')).show();
});

$('.tabs-nav a:first').trigger('click'); // Default

ul,
li,
div {
  background: hsla(0, 0%, 0%, 0);
  border: 0;
  font-size: 100%;
  margin: 0;
  outline: 0;
  padding: 0;
  vertical-align: baseline;
  font: 13px/20px "Droid Sans", Arial, "Helvetica Neue", "Lucida Grande", sans-serif;
  text-shadow: 0 1px 0 hsl(0, 100%, 100%);
}

li {
  display: list-item;
  text-align: -webkit-match-parent;
}

.tabs-nav li :hover {
  background: #eee;
}

.tabs-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tabs-nav li:first-child a {
  border-right: 0;
}

.tabs-nav .tab-active a {
  border-bottom-color: red;
  cursor: default;
}

.tabs-nav a {
  border-bottom: 3px solid hsl(120, 11%, 96%);
  background: hsl(120, 11%, 96%);
  color: hsl(215, 6%, 57%);
  display: block;
  font-size: 11px;
  font-weight: bold;
  height: 40px;
  line-height: 44px;
  text-align: center;
  text-transform: uppercase;
  width: 140px;
}

.tabs-nav li {
  float: left;
}

.tabs-stage {
  border: 1px solid hsl(210, 6%, 79%);
  -webkit-border-radius: 0 0 6px 6px;
  -moz-border-radius: 0 0 6px 6px;
  -ms-border-radius: 0 0 6px 6px;
  -o-border-radius: 0 0 6px 6px;
  border-radius: 0 0 6px 6px;
  border-top: 0;
  clear: both;
  margin-bottom: 20px;
  position: relative;
  top: -1px;
  width: 281px;
}

.tabs-stage p {
  margin: 0;
  padding: 20px;
  color: hsl(0, 0%, 33%);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<ul class="tabs-nav">
  <li class=""><a href="#tab-1" rel="nofollow">Features</a>
  </li>
  <li class="tab-active"><a href="#tab-2" rel="nofollow">Details</a>
  </li>
</ul>
<div class="tabs-stage">
  <div id="tab-1" style="display: none;">
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus nec neque nisi, dictum aliquet lectus.</p>
  </div>
  <div id="tab-2" style="display: block;">
    <p>Phasellus pharetra aliquet viverra. Donec scelerisque tincidunt diam, eu fringilla urna auctor at.</p>
  </div>
</div>

Answer 4

You can achieve this if you use box-sizing: border-box; .

To fix your specific problem, you can use the following:

  .tabs-nav .tab-active a {
     border-bottom: 3px solid red;
     cursor: default;
     box-sizing: border-box;
  }

Maybe you can also apply box-sizing: border-box globally, you have to try this for yourself. See also this blog post by paul irish.