Details

Opening braces should be preceded by a single space.

Bad: no space before brace

p{
  ...
}

Bad: more than one space before brace

p  {
  ...
}

Good

p {
  ...
}

Setting allow_single_line_padding to true allows you to use extra spaces to nicely align single line blocks, so you can write:

.icon-chevron-up    { &:before { content: "\e030"; } }
.icon-chevron-down  { &:before { content: "\e031"; } }
.icon-chevron-left  { &:before { content: "\e032"; } }
.icon-chevron-right { &:before { content: "\e033"; } }

Set style to new_line if you prefer to use a new line before braces, rather than a single space.

p
{
  ...
}