How to change the font and font size of an HTML input tag?

Generalize styles: Use selectors

Avoid going inline all the time. Use CSS selectors:

/* ID selector */
#myStylishInput {
  font-family: 'Courier New', monospace;  // Because who doesn't love typewriter aesthetic?
  font-size: 18px;
}
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Then just link it in HTML:

<input type="text" id="myStylishInput">
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Take the command on a global scale, apply styles to all input tags using type attribute selector:

/* Attribute selector */
input[type=text] {
  font-family: 'Verdana', sans-serif;   // For a modern, clean look
  font-size: 14px;
}
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Ditch defaults: Use web fonts

With CSS3, web fonts are your best friends. Fetch them from places like Google Fonts:

<link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap" rel="stylesheet">
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Then blow life into those dull inputs:

input {
  font-family: 'Poppins', sans-serif;   // Because Helvetica is too mainstream
  font-size: 16px;
}
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Adapt and interact: Responsive and hover styles

Modern web cries for responsiveness. Use dynamic units to adapt to various device sizes:

input {
  font-size: calc(1vmin + 10px);    // Size matters, especially with fonts
}
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Bring thrill to user interaction with hover effects:

input:hover {
  background-color: #f0f0f0;
  font-size: 22px;   // Surprise! I got bigger on hover
}
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Patterns of good design and accessibility

Consistency is key to good design. ElementRefine your styles and keep accessibility in mind:

input {
  font-size: larger; /* More legible for users with low vision */
}
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Also, the aria-label attributes are a great ally for screen readers:

<input type="text" aria-label="Username">
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Striking a balance between style and function enhances user experience.

Mastering specific contexts

Change styles based on context. For short information fields, consider using smaller fonts:

input.shortInfo {
  font-family: 'Tahoma', sans-serif;    // Compact and concise
  font-size: 12px;
}
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For important input fields or error messages, use distinct styles:

input.error {
  font-family: 'Impact', sans-serif;  // Impactful font for an impactful message
  font-size: 14px;
  color: #FF0000;
}
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