Much like you can frame a picture and hang it on your wall, you can add borders to your input form HTML elements that frame them visually.

There are several ways to design a form. But CSS is the way to go for designers.

Let’s give it a look to this basic form:

<div class="container">
<form action="action_page.php">

<label for="fname">First Name</label>
<input type="text" id="fname" name="firstname" placeholder="Your name..">

<label for="lname">Last Name</label>
<input type="text" id="lname" name="lastname" placeholder="Your last name..">

<input type="submit" value="Submit">

</form>
</div>

How to add custom borders to a form input with CSS?

In CSS, you can control a border’s:

width (thin, wide, 5px, etc.)
style (solid, dashed, etc.)
color (hex code, RGB value, etc.)

This results in a ton of border options that can spice up your form elements.

/* Style inputs with type="text" */
input[type=text] {
width: 100%; /* Full width */
padding: 12px; /* Some padding */ 
border: 1px solid #ccc; /* Gray border */
border-radius: 4px; /* Rounded borders */
box-sizing: border-box; /* Make sure that padding and width stays in place */
margin-top: 6px; /* Add a top margin */
margin-bottom: 16px; /* Bottom margin */
resize: vertical /* Allow the user to vertically resize the textarea (not horizontally) */
}

/* Style the submit button with a specific background color etc */
input[type=submit] {
background-color: #4CAF50;
color: white;
padding: 12px 20px;
border: none;
border-radius: 4px;
cursor: pointer;
}

/* When moving the mouse over the submit button, add a darker green color */
input[type=submit]:hover {
background-color: #45a049;
}

/* Add a background color and some padding around the form */
.container {
border-radius: 5px;
background-color: #f2f2f2;
padding: 20px;
}

You must add this on your stylesheet, and it will work fine. We added some padding to the elements to make it look better, even a hover color for the submit button.