Check out all the buttons options and can be set in different styles with Visual Composer Button shortcode.
These are the default button style, select between any color you want.
Rounded button style using any color from skin.
Square button style using any color from skin.
Outline button style using any color from skin.
Same as default outline but with rounded borders.
Same as default outline but with square borders.
Alternative 3d style with any skin color.
3D Visual Composer
Alternative 3d style with many predefined colors.
Modern style alternative, with any skin color.
Same as default modern style but with rounded borders.
Same as default modern style but with square borders.
Gradient style alternative, using the skin color.
Shadow style alternative, using the skin color.
Buttons Border Radiuses
Using porto advanced button, you can build any colored, styled and sized buttons using custom fields. Porto advanced button provides several hover effects in addition to the default fade hover effect.