Keep Line Length Between 45 and 75 Characters
Ideal measure is about 66 characters per line including spaces. Under 45 forces excessive hyphenation or ragged edges; over 75 makes readers lose their place on line return. Constrain measure per breakpoint with ch units or max-width on text containers.
Incorrect (no measure constraint):
.article {
width: 100%; /* lines can stretch to 120+ characters on wide screens */
font-size: 18px;
}Correct (constrained measure):
.article {
max-width: 65ch; /* approximately 65 characters */
font-size: 18px;
margin: 0 auto;
}
@media (max-width: 768px) {
.article {
max-width: 100%;
padding: 0 1rem;
/* Narrower screen naturally constrains measure */
}
}ch equals the width of the "0" glyph: it approximates character count but varies by typeface, so test with real content.