我用HTML和CSS編寫了下拉菜單,當用戶的鼠標懸停在菜單中的按鈕上時,我可以成功地淡入。但是,當鼠標離開下拉菜單時,下拉菜單不會淡出,它會消失嗎?我相信這是一個語法錯誤,但我不知道在哪裏。我如何讓下拉菜單淡出,就像我淡入淡出一樣?下拉菜單淡入,但不淡出
.top-block-container {
float: left;
width: 50%;
margin: 0.5% 0.25%;
}
.top-block-container:hover .top-block-dropdown {
visibility: visible;
opacity: 1;
transform: translateY(0);
height: auto;
}
.top-block {
width: 100%;
font-family: Lato;
font-weight: 900;
text-align: center;
padding: 10px 0;
border-radius: 50px;
font-size: 25px;
transition: background-color 0.25s linear, box-shadow 0.25s linear;
float: left;
background: linear-gradient(to bottom, #CCCCCC, #AAAAAA);
box-shadow: 0 0 5px black;
margin: 0;
}
.top-block:hover {
cursor: pointer;
box-shadow: 0 0 15px black;
}
.top-block-dropdown {
width: 100%;
background: linear-gradient(to bottom, #CCCCCC, #AAAAAA);
float: left;
margin-top: 7.5px;
border-radius: 25px;
box-shadow: 0 0 15px black;
visibility: hidden;
opacity: 0;
height: 0;
transform: translateY(-2em);
transition: visibility 0s, transform 0.25s, opacity 0.25s linear;
}
.dropdown-option-heading {
font-family: Lato;
font-weight: 700;
margin: 5px 0 0 0;
padding: 5px 10px;
border-bottom: 2px solid white;
}
.dropdown-option {
font-family: Lato;
font-weight: 400;
text-align: center;
border-bottom: 1px solid white;
margin: 0;
padding: 5px 10px;
transition: box-shadow 0.25s linear;
}
.dropdown-option:hover {
background: linear-gradient(to top, dodgerblue, #00B0FF);
cursor: pointer;
}
.last-option {
border: 0;
border-bottom-left-radius: 25px;
border-bottom-right-radius: 25px;
}
<div class="top-block-container">
<h1 class="top-block">ECWMF</h1>
<div class="top-block-dropdown">
<p class="dropdown-option-heading">Global Models</p>
<p class="dropdown-option">GFS</p>
<p class="dropdown-option">ECMWF</p>
<p class="dropdown-option">CMC</p>
<p class="dropdown-option">NAVGEM</p>
<p class="dropdown-option">UKMET</p>
<p class="dropdown-option-heading">Mesoscale Models</p>
<p class="dropdown-option">HRRR</p>
<p class="dropdown-option">HWRF</p>
<p class="dropdown-option">NAM 32km</p>
<p class="dropdown-option">NAM 12km</p>
<p class="dropdown-option">RAP</p>
<p class="dropdown-option">SREF</p>
<p class="dropdown-option last-option">HIRESW</p>
</div>
</div>
因爲你的轉換有'知名度0s'。給出一個非零值和可見性轉換。或者從所有這些定義中刪除「可見性」。 「不透明」就足夠了。 –