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宽度：100％的子元素大于父元素

htmlcsshoverflexboxwidth
3
我知道有很多类似于这个的线程，但我似乎无法解决这个width:100%问题。在菜单上有个滑动的描述，它比按钮要大。我尝试添加box-sizing:border-box;，但没有效果。我不知道问题出在哪里。可能与边距、填充和两个不同的CSS代码有关#mainicons和#mainicons i吗？

我的代码：

#mainicons {
  height: 50px;
  width: 70px;
  position: fixed;
  top: 250px;
  left: 0px;
  text-align: center;
}

#mainicons>a {
  position: relative;
  margin-top: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

#mainicons i {
  display: flex;
  flex-direction: column;
  margin-top: 20px;
  height: 40px;
  width: 50px;
  padding: 10px;
  color: #fff;
  background: #CE9C87;
  text-align: center;
  font-size: 15px;
  line-height: 40px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons i:hover {
  -webkit-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  -moz-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  box-shadow: inset 7px 0px 0px 0px #CE9C87;
  color: #CE9C87;
  background: #fff;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons span {
  color: #CE9C87;
  background: #fff;
  width: 100%;
  height: 100%;
  z-index: -1;
  font-size: 15px;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  left: -100px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons a:hover>span {
  left: 70px;
}
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

<body bgcolor="#E6E6FA">
  <div id="mainicons">
    <a href="/"><i class="fa fa-home"></i><span>Home</span></a>
    <a href="/ask"><i class="fa fa-envelope"></i><span>Ask</span></a>
    <a href="/submit"><i class="fa fa-pencil "></i><span>Request</span></a>
    <a href="/archive"><i class="fa fa-clock-o"></i><span>Archive</span></a>
  </div>

感谢您的帮助! :)
3个回答
1
1

这是您想要的吗？从#mainicons i中去除margin-top。

另外，我删除了top: 250px，只是为了在此处显示示例。

#mainicons {
  height: 50px;
  width: 70px;
  position: fixed;
  top: 0px;
  left: 0px;
  text-align: center;
}

#mainicons>a {
  position: relative;
  margin-top: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

#mainicons i {
  display: flex;
  flex-direction: column;
  height: 40px;
  width: 50px;
  padding: 10px;
  color: #fff;
  background: #CE9C87;
  text-align: center;
  font-size: 15px;
  line-height: 40px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons i:hover {
  -webkit-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  -moz-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  box-shadow: inset 7px 0px 0px 0px #CE9C87;
  color: #CE9C87;
  background: #fff;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons span {
  color: #CE9C87;
  background: #fff;
  width: 100%;
  height: 100%;
  z-index: -1;
  font-size: 15px;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  left: -100px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons a:hover>span {
  left: 70px;
}
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

<body bgcolor="#E6E6FA">
  <div id="mainicons">
    <a href="/"><i class="fa fa-home"></i><span>Home</span></a>
    <a href="/ask"><i class="fa fa-envelope"></i><span>Ask</span></a>
    <a href="/submit"><i class="fa fa-pencil "></i><span>Request</span></a>
    <a href="/archive"><i class="fa fa-clock-o"></i><span>Archive</span></a>
  </div>

1

也许你想要这样的东西

移除

从#mainicons i中移除margin-top: 20px

#mainicons {
  height: 50px;
  width: 70px;
  position: fixed;
  top: 250px;
  left: 0px;
  text-align: center;
}

#mainicons>a {
  position: relative;
  margin-top: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

#mainicons i {
  display: flex;
  flex-direction: column;
  /*margin-top: 20px;*/
  height: 40px;
  width: 50px;
  padding: 10px;
  color: #fff;
  background: #CE9C87;
  text-align: center;
  font-size: 15px;
  line-height: 40px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons i:hover {
  -webkit-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  -moz-box-shadow: inset 7px 0px 0px 0px #CE9C87;
  box-shadow: inset 7px 0px 0px 0px #CE9C87;
  color: #CE9C87;
  background: #fff;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons span {
  color: #CE9C87;
  background: #fff;
  width: 100%;
  height: 100%;
  z-index: -1;
  font-size: 15px;
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  left: -100px;
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;
}

#mainicons a:hover>span {
  left: 70px;
}
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

<body bgcolor="#E6E6FA">
  <div id="mainicons">
    <a href="/"><i class="fa fa-home"></i><span>Home</span></a>
    <a href="/ask"><i class="fa fa-envelope"></i><span>Ask</span></a>
    <a href="/submit"><i class="fa fa-pencil "></i><span>Request</span></a>
    <a href="/archive"><i class="fa fa-clock-o"></i><span>Archive</span></a>
  </div>

非常感谢！您能告诉我为什么margin-top会触发那个问题吗？ :) - Maëlle
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