Initial values: margin = a margin-horizontal = a margin-left = a margin-right = a Setting 'margin' to 4: margin = 4 margin-horizontal = 4 margin-left = 4 margin-right = 4 Setting 'margin-horizontal' to 8: margin = 4 margin-horizontal = 8 margin-left = 8 margin-right = 8 Setting 'margin-left' to 3: margin = 4 margin-horizontal = 8 margin-left = 3 margin-right = 8