私はウェブサイトを作成していて、いくつかのボタンを作成し、それらに-webkit-box-flexプロパティを追加しました。それはうまくいきました。ただし、ボタンの1つにドロップダウンメニューを追加すると、-webkit-box-flexプロパティがボタンに適用されなくなり、機能しなくなります。誰かが何が起こっているのか教えてもらえますか?
これがjsfiddleです:
*{
margin: 0px;
padding: 0px;
 }
h1{
font: bold 20px PrimaSans BT;
 }
 h2{
font: italic 14px PrimaSans BT;
  }
header, section, footer, aside, nav, article, hgroup, ul, li{
 display: block;
 }
 #wrapper{
max-width: 1000px;
margin: 20px 0px;
display: -webkit-box;
display: -moz-box;
-webkit-box-orient: vertical;
-moz-box-orient: vertical;
-webkit-box-flex: 1;
-moz-box-flex: 1;
margin-left: auto ;
margin-right: auto ;
}
#searchbox{
float: right;
margin-bottom: 10px;
}
body{
width: 100%;
margin: 0;
display:-moz-box;
-moz-box-pack: center;
display:-webkit-box;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0,    `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-repeat: no-repeat;
background-attachment: fixed;
  }
 #navigation{
display: block;
padding: 10px;
margin: 5px;
margin-bottom: 0px;
-webkit-border-radius: 15px;
width: 800px;
height: 60px;
display: -webkit-box;
-webkit-box-orient: horizontal;
display: -moz-box;
-moz-box-orient: horizontal;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
 }
 #navigation li:hover ul{
display: block;
 }
 #navigation ul{
margin: 0px;
padding: 0px;
 }
 #navigation li{
position: relative;
float: left;
list-style-type: none;
 }
 #navigation ul:after{
display: block;
clear: both;
visibility: hidden;
 }
  #navigation li a{
text-decoration: none;
display: block;
color: black;
border-right: 1px solid grey;
padding: 10px 25px;
 }
  #navigation ul ul{
position: absolute;
border: 20px;
left: 0px;
width: 125px;
display: none;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
  }
  #navigation ul ul li{
border: 1px solid grey;
width: 99%;
-webkit-transition: background 2s
  }
   #navigation ul ul li:hover{
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
  }
 #navigation ul ul li a{
border-right: none;
  }
  .navigation_button{
font: bold 18px PrimaSans BT;
-webkit-box-flex: 1;
width: 100px;
padding: 10px;
margin: 10px;
text-align: center;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#ffffff), color-stop(1, #bababa));
-webkit-border-radius: 10px;
-webkit-transition: -webkit-transform 2s, opacity 2s, background 2s, scale 2s,
  }
   .navigation_button:hover{
-webkit-transform: scale(1.05);
opacity: 1;
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
background-image: -moz-gradient(linear, left top, left bottom, color-stop(0, `enter code here`#fffc01), color-stop(1, #ffde00));
 }
 #main_section{
border: 1px solid grey;
width: 750px;
margin-left: 40px;
margin-right: 30px;
border-top: 0px;
height: 800px;
margin-bottom: 10px;
-webkit-border-bottom-right-radius: 10px;
-webkit-border-bottom-left-radius: 10px;
background-color: #f1f1f1;
-webkit-box-flex: 1;
 }
 .article_1{
border: 1px solid gray;
background: white;
-webkit-box-flex: 1;
margin-left: 10px;
margin-right: 10px;
margin-top: 10px;
padding: 10px;
  }
  .article_1_footer{
text-align: right;
  }
  #footer{
text-align: center;
font: italic 12px Times New Roman
  }
ありがとう!