how to add variables in scss code example

Example 1: scss variables

$base-color: #c6538c;
$border-dark: rgba($base-color, 0.88);

.alert {
  border: 1px solid $border-dark;
}

Example 2: how to make a scss variable

$variableName = item

$gray = #404040

body{
	background:$gray; 
}