font-weight
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Description

The 'font-weight' property specifies the weight of the font.

normal weight equates to 400 whilst bold equates to 700.

Initial Value : normal
Applies to : all elements
Inherited : yes
Possible Values 
normal | bold | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900
Example(s) 
p { font-weight: normal }   /* 400 */
h1 { font-weight: 700 }     /* bold */
body { font-weight: 400 }
strong { font-weight: bolder } /* 500 if available */
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