Change letter-spacing

Hi. The source of main page shown is:

/astrid/style.css?ver=4.7.1

And code from css is:

body {
font-family: ‘Open Sans’, sans-serif;
font-size: 14px;
color: #ffffff;
word-wrap: break-word;
line-height: 1.0;
letter-spacing: 1.9px; …

But when I`am try to change letter-spacing: 1.9px to 1.0, and font-size: 14px; to 28
Its not working!

Where i can change this letter-spacing: 1.9px ???
Help please!

Hi,

You can use this CSS code:

body {
    letter-spacing: 1px;
    font-size: 28px;
}

put those CSS code in customizer > additional CSS.

Regards,
Awan