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Pseudo-class :hover and :active, mouseover and mouse click on CSS

Hover mouseover on CSS

Use span:hover and the element will change color on hover.

span:hover {
    background-color: #1b5392;
}
.sign_up:hover {
    background-color: #1b5392;
}

The button enter the site changes color when you hover the mouse.

<STYLE>
.button_sign_up {
    width: 320px;
    height: 45px;
    font-size: 21px;
    padding: 10px 20px;
    text-align: center;
    border-radius: 5px;
    font-family: sans-serif;
    letter-spacing: 1px;
    color: #fff;
    background-color: #0071f0;
}
.button_sign_up:hover{
    background-color: #1b5392;
}
</STYLE>
<div style="text-align:center;">
	<button class="button_sign_up">Sign Up</button>
</div>

Use the CSS property :hover to change the color of the menu item and to open the submenu.

<style>
   ul {
    width: 180px;
    list-style: none;
    margin: 50px;
    padding: 0;
    font-family: Arial, sans-serif;
    font-size: 10pt;
   }
   li ul {
    position: absolute; /* Submenus are positioned absolutely */
    display: none; /* Hide the submenu */
    margin-left: 100px; /* Move the submenu to the right */
    margin-top: -2em; /* Move the submenu up */
   }
   li a {
    display: block; /* Link as block element */
    padding: 5px; /* Margins around the label */
    text-decoration: none; /* Remove underlining from links */
    color: #666;
    border: 1px solid #ccc;
    background-color: #f0f0f0;
    border-bottom: none; /* We do not draw the border from below */
   }
   li a:hover {
    color: #ffe;
    background-color: #5488af;
   }
   li:hover ul { 
    display: block;
   }
   .brd {
    border-bottom: 1px solid #ccc;
   }
   ul.menu li {
    display: inline; /* Отображать как строчный 
   }
</style>

<ul class="menu">
	<li><a href="#" class="brd">Clients</a>
		<ul> 
		 <li><a href="#">Active Client</a></li> 
		 <li><a href="#">Dialog</a></li> 
		 <li><a href="#">Client BD</a></li> 
		 <li><a href="#" class="brd">Statistics Client</a></li> 
		</ul> 
	</li> 
</ul>

DEMO

Active mouse click on CSS

Use span:active and the element will change color on mouse click.

span:active {
    background-color: #1b5392;
}
.sign_up:active {
    background-color: #1b5392;
}

The button enter the site changes color when you click the mouse.

<STYLE>
.button_sign_up {
    width: 320px;
    height: 45px;
    font-size: 21px;
    padding: 10px 20px;
    text-align: center;
    border-radius: 5px;
    font-family: sans-serif;
    letter-spacing: 1px;
    color: #fff;
    background-color: #0071f0;
}
.button_sign_up:active{
    background-color: #1b5392;
}
</STYLE>
<div style="text-align:center;">
	<button class="button_sign_up">Sign Up</button>
</div>

Use the CSS property :active to change the color of the menu item and to open the submenu.

<style>
   ul {
    width: 180px;
    list-style: none;
    margin: 50px;
    padding: 0;
    font-family: Arial, sans-serif;
    font-size: 10pt;
   }
   li ul {
    position: absolute;
    display: none;
    margin-left: 100px;
    margin-top: -2em;
   }
   li span,li a {
    display: block;
    padding: 5px;
    text-decoration: none;
    color: #666;
    border: 1px solid #ccc;
    background-color: #f0f0f0;
    border-bottom: none;
   }
   li a:active,li span:active {
    color: #ffe;
    background-color: #5488af;
   }
   li:hover ul { 
    display: block;
   }
   .brd {
    border-bottom: 1px solid #ccc;
   }
</style>

<ul class="menu">
 <li><span class="brd">Clients</span>
  <ul> 
   <li><a href="#">Active Client</a></li> 
   <li><a href="#">Dialog</a></li> 
   <li><a href="#">Client BD</a></li> 
   <li><a href="#" class="brd">Statistics Client</a></li> 
  </ul> 
 </li> 
</ul>

DEMO