I think what you’re looking for are viewport percentage units.
Try this:
.about-content-title h1 { font-size: 5vw; }
With this adjustment, when you re-size the browser window the font will scale in size.
From the spec:
5.1.2. Viewport-percentage lengths: the
vw
,vh
,vmin
,vmax
unitsThe viewport-percentage lengths are relative to the size of the
initial containing block. When the height or width of the initial
containing block is changed, they are scaled accordingly.
- vw unit – Equal to 1% of the width of the initial containing block.
- vh unit – Equal to 1% of the height of the initial containing
block.- vmin unit – Equal to the smaller of
vw
orvh
.- vmax unit – Equal to the larger of
vw
orvh
.
Using percentage values (%) doesn’t scale your fonts relative to the viewport because these values are relative to a parent or ancestor. See the spec: 4.3. Percentages: the <percentage>
type