How I make my Dropdown Menu Fade-In Using CSS - html

Question

#menu {
width: 100%;
margin: 10px auto;
}
#menu ul,
#menu li {
margin: 0 auto;
padding: 0 0;
list-style: none
}
#menu ul {
width: 100%;
}
#menu li {
float: left;
display: inline;
position: relative;
}
#menu a {
display: block;
line-height: 35px;
padding: 0 14px;
text-decoration: none;
}
#menu li a {
border-right: 1px solid #e5e5e5;
}
#menu li a:hover {
color: #444;
background-color: #e5e5e5;
}
#menu input {
display: none;
margin: 0 0;
padding: 0 0;
width: 80px;
height: 30px;
opacity: 0;
}
#menu label {
font-size: 20px;
display: none;
width: 35px;
height: 20px;
line-height: 20px;
text-align: center;
color: #77778b
}
#menu label span {
position: absolute;
left: 35px;
}
#menu ul.menus {
height: auto;
overflow: hidden;
width: 180px;
border-top: 1px solid #e5e5e5;
border-left: 1px solid #e5e5e5;
border-bottom: 1px solid #e5e5e5;
position: absolute;
z-index: 99;
display: none;
left: -1px;
}
#menu ul.menus li {
display: block;
width: 100%;
}
#menu ul.menus a {
color: #77778b;
}
#menu li:hover ul.menus {
display: block
}
<nav id='menu'>
<input type='checkbox' />
<label><i class='icon-reorder' /><span>Menu</span>
</label>
<ul>
<li><a href='/'>Home</a>
</li>
<li><a class='dropdown' href='#'>Menu1</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
</ul>
</li>
<li><a class='dropdown' href='#'>Menu2</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
<li><a href='#'>Submenu3</a>
</li>
</ul>
</li>
</ul>
</nav>
How can I make the Dropdowns Fade in with only CSS? A bit noobish question but still trying to understand CSS Any one have any idea how to make it possible plz suggest it.
Thanks !

Answer 1

One possible solution is to use opacity: 0 instead of display: none and using transition on hover:
#menu {
width: 100%;
margin: 10px auto;
}
#menu ul,
#menu li {
margin: 0 auto;
padding: 0 0;
list-style: none
}
#menu ul {
width: 100%;
}
#menu li {
float: left;
display: inline;
position: relative;
}
#menu a {
display: block;
line-height: 35px;
padding: 0 14px;
text-decoration: none;
}
#menu li a {
border-right: 1px solid #e5e5e5;
}
#menu li a:hover {
color: #444;
background-color: #e5e5e5;
}
#menu input {
display: none;
margin: 0 0;
padding: 0 0;
width: 80px;
height: 30px;
opacity: 0;
}
#menu label {
font-size: 20px;
display: block;
width: 35px;
height: 20px;
line-height: 20px;
text-align: center;
color: #77778b;
visibility: hidden;
}
#menu label span {
position: absolute;
left: 35px;
}
#menu ul.menus {
height: auto;
overflow: hidden;
width: 180px;
border-top: 1px solid #e5e5e5;
border-left: 1px solid #e5e5e5;
border-bottom: 1px solid #e5e5e5;
position: absolute;
z-index: 99;
display: block;
left: -1px;
opacity: 0;
}
#menu ul.menus li {
display: block;
width: 100%;
}
#menu ul.menus a {
color: #77778b;
}
#menu li:hover ul.menus {
opacity: 1;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-ms-transition: opacity 1s ease-in-out;
-o-transition: opacity 1s ease-in-out;
transition: opacity 1s ease-in-out;
}
<nav id='menu'>
<input type='checkbox' />
<label><i class='icon-reorder' /><span>Menu</span>
</label>
<ul>
<li><a href='/'>Home</a>
</li>
<li><a class='dropdown' href='#'>Menu1</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
</ul>
</li>
<li><a class='dropdown' href='#'>Menu2</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
<li><a href='#'>Submenu3</a>
</li>
</ul>
</li>
</ul>
</nav>
Also you can use transition same way to animate on mouse out:
#menu {
width: 100%;
margin: 10px auto;
}
#menu ul,
#menu li {
margin: 0 auto;
padding: 0 0;
list-style: none
}
#menu ul {
width: 100%;
}
#menu li {
float: left;
display: inline;
position: relative;
}
#menu a {
display: block;
line-height: 35px;
padding: 0 14px;
text-decoration: none;
}
#menu li a {
border-right: 1px solid #e5e5e5;
}
#menu li a:hover {
color: #444;
background-color: #e5e5e5;
}
#menu input {
display: none;
margin: 0 0;
padding: 0 0;
width: 80px;
height: 30px;
opacity: 0;
}
#menu label {
font-size: 20px;
display: block;
width: 35px;
height: 20px;
line-height: 20px;
text-align: center;
color: #77778b;
visibility: hidden;
}
#menu label span {
position: absolute;
left: 35px;
}
#menu ul.menus {
height: auto;
overflow: hidden;
width: 180px;
border-top: 1px solid #e5e5e5;
border-left: 1px solid #e5e5e5;
border-bottom: 1px solid #e5e5e5;
position: absolute;
z-index: 99;
display: block;
left: -1px;
opacity: 0;
-webkit-transition: opacity 0.5s ease-in-out;
-moz-transition: opacity 0.5s ease-in-out;
-ms-transition: opacity 0.5s ease-in-out;
-o-transition: opacity 0.5s ease-in-out;
transition: opacity 0.5s ease-in-out;
}
#menu ul.menus li {
display: block;
width: 100%;
}
#menu ul.menus a {
color: #77778b;
}
#menu li:hover ul.menus {
opacity: 1;
-webkit-transition: opacity 1s ease-in-out;
-moz-transition: opacity 1s ease-in-out;
-ms-transition: opacity 1s ease-in-out;
-o-transition: opacity 1s ease-in-out;
transition: opacity 1s ease-in-out;
}
<nav id='menu'>
<input type='checkbox' />
<label><i class='icon-reorder' /><span>Menu</span>
</label>
<ul>
<li><a href='/'>Home</a>
</li>
<li><a class='dropdown' href='#'>Menu1</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
</ul>
</li>
<li><a class='dropdown' href='#'>Menu2</a>
<ul class='menus'>
<li><a href='#'>Submenu1</a>
</li>
<li><a href='#'>Submenu2</a>
</li>
<li><a href='#'>Submenu3</a>
</li>
</ul>
</li>
</ul>
</nav>