Yes, you should be able to do this with custom CSS. The theme uses different sizes depending on the breakpoint (screen size). Assuming you are talking about the title area (h1):
KIT GUITAR BUILDERS
you know you can do it …
The current settings are:
Starting with XS the hero Title is 42px
SM Size≥ 576px
screens the text is set at 54px
MD size≥ 768px
its set to 64px
To override try adding the following CSS:
/* XS screens(ALL) size */
h1.hero-title {
font-size: 35px;
}
/* SM screens and Up */
@media (min-width: 576px) {
h1.hero-title {
font-size: 44px;
}
}
/* MD screens and Up */
@media (min-width: 768px) {
h1.hero-title {
font-size: 54px;
}
}
You can change the px sizes to anything you want.