​How to Change a HTML5 input placeholder color with CSS

You can use the ::placeholder pseudo-element in CSS to target the placeholder text of an HTML5 input and change its color.

Here is an example of how you can change the placeholder color to red:

input::placeholder {

  color: red;

}

You can also use other CSS properties like font-size, font-family, etc.

input::placeholder {

  color: red;

  font-size: 16px;

  font-family: Arial, sans-serif;

}

You can also target specific input using id or class

<input type="text" id="username" placeholder="Username">

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#username::placeholder {

  color: red;

}

<input class="myclass" type="text" placeholder="Username">

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.myclass::placeholder {

  color: red;

}

Please note that this will only work in modern browsers that support the ::placeholder pseudo-element, so you may need to provide a fallback solution for older browsers.