以前用bootstrap 4的间距，具体可以参考这里, 后来在另一个没有bootstrap的工程想用类似的，找到了这个(.scss)：

// https://github.com/jgthms/bulma/issues/451#issuecomment-331758839
$sizeUnit: rem;
$marginKey: 'm';
$paddingKey: 'p';
$separator: '-';
$sizes: (
    ('none', 0),
    ('xxs', 0.125),
    ('xs', 0.25),
    ('sm', 0.5),
    ('md', 1),
    ('lg', 2),
    ('xl', 4),
    ('xxl', 8),
);
$positions: (
    ('t', 'top'),
    ('r', 'right'),
    ('b', 'bottom'),
    ('l', 'left')
);

@function sizeValue($key, $value) {
    @return if($key == 'none', 0, $value + $sizeUnit);
}

@each $size in $sizes {
    $sizeKey: nth($size, 1);
    $sizeValue: nth($size, 2);
    .#{$marginKey}#{$separator}#{$sizeKey} {
        margin: sizeValue($sizeKey, $sizeValue);
    }
    .#{$paddingKey}#{$separator}#{$sizeKey} {
        padding: sizeValue($sizeKey, $sizeValue);
    }
    @each $position in $positions {
        $posKey: nth($position, 1);
        $posValue: nth($position, 2);
        .#{$marginKey}#{$separator}#{$posKey}#{$separator}#{$sizeKey} {
            margin-#{$posValue}: sizeValue($sizeKey, $sizeValue);
        }
        .#{$paddingKey}#{$separator}#{$posKey}#{$separator}#{$sizeKey} {
            padding-#{$posValue}: sizeValue($sizeKey, $sizeValue);
        }
    }
}

将会生成如下CSS:

.m-none { margin: 0; }
.p-none { padding: 0; }
.m-t-none { margin-top: 0; }
.p-t-none { padding-top: 0; }
.m-r-none { margin-right: 0; }
.p-r-none { padding-right: 0; }
.m-b-none { margin-bottom: 0; }
.p-b-none { padding-bottom: 0; }
.m-l-none { margin-left: 0; }
.p-l-none { padding-left: 0; }
.m-xxs { margin: 0.125rem; }
.p-xxs { padding: 0.125rem; }
.m-t-xxs { margin-top: 0.125rem; }
.p-t-xxs { padding-top: 0.125rem; }
.m-r-xxs { margin-right: 0.125rem; }
.p-r-xxs { padding-right: 0.125rem; }
.m-b-xxs { margin-bottom: 0.125rem; }
.p-b-xxs { padding-bottom: 0.125rem; }
.m-l-xxs { margin-left: 0.125rem; }
.p-l-xxs { padding-left: 0.125rem; }
.m-xs { margin: 0.25rem; }
.p-xs { padding: 0.25rem; }
.m-t-xs { margin-top: 0.25rem; }
.p-t-xs { padding-top: 0.25rem; }
.m-r-xs { margin-right: 0.25rem; }
.p-r-xs { padding-right: 0.25rem; }
.m-b-xs { margin-bottom: 0.25rem; }
.p-b-xs { padding-bottom: 0.25rem; }
.m-l-xs { margin-left: 0.25rem; }
.p-l-xs { padding-left: 0.25rem; }
.m-sm { margin: 0.5rem; }
.p-sm { padding: 0.5rem; }
.m-t-sm { margin-top: 0.5rem; }
.p-t-sm { padding-top: 0.5rem; }
.m-r-sm { margin-right: 0.5rem; }
.p-r-sm { padding-right: 0.5rem; }
.m-b-sm { margin-bottom: 0.5rem; }
.p-b-sm { padding-bottom: 0.5rem; }
.m-l-sm { margin-left: 0.5rem; }
.p-l-sm { padding-left: 0.5rem; }
.m-md { margin: 1rem; }
.p-md { padding: 1rem; }
.m-t-md { margin-top: 1rem; }
.p-t-md { padding-top: 1rem; }
.m-r-md { margin-right: 1rem; }
.p-r-md { padding-right: 1rem; }
.m-b-md { margin-bottom: 1rem; }
.p-b-md { padding-bottom: 1rem; }
.m-l-md { margin-left: 1rem; }
.p-l-md { padding-left: 1rem; }
.m-lg { margin: 2rem; }
.p-lg { padding: 2rem; }
.m-t-lg { margin-top: 2rem; }
.p-t-lg { padding-top: 2rem; }
.m-r-lg { margin-right: 2rem; }
.p-r-lg { padding-right: 2rem; }
.m-b-lg { margin-bottom: 2rem; }
.p-b-lg { padding-bottom: 2rem; }
.m-l-lg { margin-left: 2rem; }
.p-l-lg { padding-left: 2rem; }
.m-xl { margin: 4rem; }
.p-xl { padding: 4rem; }
.m-t-xl { margin-top: 4rem; }
.p-t-xl { padding-top: 4rem; }
.m-r-xl { margin-right: 4rem; }
.p-r-xl { padding-right: 4rem; }
.m-b-xl { margin-bottom: 4rem; }
.p-b-xl { padding-bottom: 4rem; }
.m-l-xl { margin-left: 4rem; }
.p-l-xl { padding-left: 4rem; }
.m-xxl { margin: 8rem; }
.p-xxl { padding: 8rem; }
.m-t-xxl { margin-top: 8rem; }
.p-t-xxl { padding-top: 8rem; }
.m-r-xxl { margin-right: 8rem; }
.p-r-xxl { padding-right: 8rem; }
.m-b-xxl { margin-bottom: 8rem; }
.p-b-xxl { padding-bottom: 8rem; }
.m-l-xxl { margin-left: 8rem; }
.p-l-xxl { padding-left: 8rem; }