How do you change the color of a click button in css?

Each link has five different states: link, hover, active, focus and visited.

Link is the normal appearance, hover is when you mouse over, active is the state when it's clicked, focus follows active and visited is the state you end up when you unfocus the recently clicked link.

I'm guessing you want to achieve a different style on either focus or visited, then you can add the following CSS:

a { color: #00c; }
a:visited { #ccc; }
a:focus { #cc0; }

A recommended order in your CSS to not cause any trouble is the following:

a
a:visited { ... }
a:focus { ... }
a:hover { ... }
a:active { ... }

You can use your web browser's developer tools to force the states of the element like this (Chrome->Developer Tools/Inspect Element->Style->Filter :hov): Force state in Chrome Developer Tools

Learn how to style buttons using CSS.

Basic Button Styling

Example

.button {
  background-color: #4CAF50; /* Green */
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
}

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Button Colors

Use the background-color property to change the background color of a button:

Example

.button1 {background-color: #4CAF50;} /* Green */
.button2 {background-color: #008CBA;} /* Blue */
.button3 {background-color: #f44336;} /* Red */
.button4 {background-color: #e7e7e7; color: black;} /* Gray */
.button5 {background-color: #555555;} /* Black */

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Button Sizes

Use the font-size property to change the font size of a button:

Example

.button1 {font-size: 10px;}
.button2 {font-size: 12px;}
.button3 {font-size: 16px;}
.button4 {font-size: 20px;}
.button5 {font-size: 24px;}

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Use the padding property to change the padding of a button:

Example

.button1 {padding: 10px 24px;}
.button2 {padding: 12px 28px;}
.button3 {padding: 14px 40px;}
.button4 {padding: 32px 16px;}
.button5 {padding: 16px;}

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Rounded Buttons

Use the border-radius property to add rounded corners to a button:

Example

.button1 {border-radius: 2px;}
.button2 {border-radius: 4px;}
.button3 {border-radius: 8px;}
.button4 {border-radius: 12px;}
.button5 {border-radius: 50%;}

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Colored Button Borders

Use the border property to add a colored border to a button:

Example

.button1 {
  background-color: white;
  color: black;
  border: 2px solid #4CAF50; /* Green */
}
...

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Hoverable Buttons

Use the :hover selector to change the style of a button when you move the mouse over it.

Tip: Use the transition-duration property to determine the speed of the "hover" effect:

Example

.button {
  transition-duration: 0.4s;
}

.button:hover {
  background-color: #4CAF50; /* Green */
  color: white;
}
...

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Shadow Buttons

Use the box-shadow property to add shadows to a button:

Example

.button1 {
  box-shadow: 0 8px 16px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);
}

.button2:hover {
  box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}

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Disabled Buttons

Use the opacity property to add transparency to a button (creates a "disabled" look).

Tip: You can also add the cursor property with a value of "not-allowed", which will display a "no parking sign" when you mouse over the button:

Button Width

By default, the size of the button is determined by its text content (as wide as its content). Use the width property to change the width of a button:

Example

.button1 {width: 250px;}
.button2 {width: 50%;}
.button3 {width: 100%;}

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Button Groups

Remove margins and add float:left to each button to create a button group:

Bordered Button Group

Use the border property to create a bordered button group:

Vertical Button Group

Use display:block instead of float:left to group the buttons below each other, instead of side by side:

Button on Image

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Animated Buttons

How do I change the color of clicked buttons?

How do I change the color of a selected button in HTML?

How do you keep active CSS style after clicking a button?