将下拉菜单拉到左上角，并使用 css 在移动设备上使其全宽

Question

我有这个代码：

CSS

.flyout {
  position: absolute;
  top: 30px;
  right: 15px;
  background-color: #FFF;
  padding: 20px;
  border: 1px solid #eaeaea;
  z-index: 999;
  width: 400px;
  border-top: 3px solid #337AB7;
  display: none;
  transition-timing-function: ease-in-out 1s;
  /* Firefox v3.5+ */
  -moz-box-shadow:0px 4px 10px rgba(0,0,0,0.1);
  /* Safari v3.0+ and by Chrome v0.2+ */
  -webkit-box-shadow:0px 4px 10px rgba(0,0,0,0.1);
  /* Firefox v4.0+ , Safari v5.1+ , Chrome v10.0+, IE v10+ and by Opera v10.5+ */
  box-shadow:0px 4px 10px rgba(0,0,0,0.1);
  -ms-filter:"progid:DXImageTransform.Microsoft.dropshadow(OffX=0,OffY=4,Color=#1a000000,Positive=true)";
  filter:progid:DXImageTransform.Microsoft.dropshadow(OffX=0,OffY=4,Color=#1a000000,Positive=true);
}
@media (max-width: 768px) {
    .fav {
        position: relative;
    }
    .flyout {
        left:0;
    }
}

.flyout:before {
  border-bottom: 10px solid #337AB7;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  content: "";
  display: inline-block;
  right: 15px;
  position: absolute;
  top: -10px;
  transition: border ease-in-out .18s;
}

HTML

<li class="fav">
    <a href="#" class="tools" target="_self" title="Favoriten">
        <span class="glyphicon glyphicon-star"></span>
        <span class="hidden-sm hidden-md hidden-xs"> Meine Favoriten (3)</span>
    </a>
    <div class="flyout">
        <h4>
            Meine Favoriten
            <span class="glyphicon glyphicon-remove pull-right" 
                  aria-hidden="true" title="Schliessen"></span>
        </h4>

        <div class="flyout-item">
            <a href="#"><b>Abteilungsleiter Lüftung</b> (80%-100%)</a>
            <span class="glyphicon glyphicon-trash pull-right" 
                  aria-hidden="true" title="Entfernen"></span>
            <br>
            <span class="glyphicon glyphicon-map-marker" 
                  aria-hidden="true"></span> 
            XY
        </div>
    </div>
</li>

我的目标是直到断点 768，弹出窗口应该是视口的全宽。所以手机应该是全宽的。

这是一个代码笔http://codepen.io/anon/pen/NdPQaQ 它适用于引导下拉菜单。

您能否解释一下，为什么 left: 0 在这种情况下不起作用？

Answer 1

添加到特定分辨率

@media (max-width: 767px)
{
    li.fav 
    {
        position: static;
    }
}