@mixin input-group-pre {
    background-image: $input-group-pre-background-image;
    background-position: center;
    background-repeat: no-repeat;
    background-size: $input-group-pre-background-size;
    border-radius: $input-group-border-radius 0 0 $input-group-border-radius;
    min-width: $input-group-pre-width;
}