Answer by Ryall for Outline effect to text

This mixin for SASS will give smooth results, using 8-axis:

@mixin stroke($size: 1px, $color: #000) {  text-shadow:    -#{$size} -#{$size} 0 $color,     0        -#{$size} 0 $color,     #{$size} -#{$size} 0 $color,     #{$size}  0        0 $color,     #{$size}  #{$size} 0 $color,     0         #{$size} 0 $color,    -#{$size}  #{$size} 0 $color,    -#{$size}  0        0 $color;}

And normal CSS:

text-shadow:  -1px -1px 0 #000,   0   -1px 0 #000,   1px -1px 0 #000,   1px  0   0 #000,   1px  1px 0 #000,   0    1px 0 #000,  -1px  1px 0 #000,  -1px  0   0 #000;