64px = 4rem

CSS Example

/* 64px as rem */
.element {
  font-size: 4rem; /* 64px */
}

When to Use 64px (4rem)

A value of 64px (4rem) is commonly used for hero headings, display titles, and large promotional text. In responsive web design, using 4rem instead of 64px ensures your hero and display text scale proportionally when users change their browser font size settings.

Why Use REM?

REM units are relative to the root element's font-size, making them ideal for accessible, responsive designs. When you write 4rem instead of 64px, your layout respects user preferences — if someone sets their browser to a larger font size for readability, all your rem-based values scale up proportionally.