(此爲慕課學習筆記,方便日後學習)
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學習功能:下拉菜單之變幻菜單
author: lisa於2018-5-30
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/*清楚自己的浮動*/
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/*去除下劃線*/
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width: 80px;
text-align: center;
}
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display: none;
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.top-nav li a:hover span {
display: block;
background: #DC4E1B;
color: white;
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.top-nav li a:hover {
margin-top: -20px;
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