how to change view more button and buy now button colour

Hi Anand

The button colors, unfortunately, aren’t easily changed. Here is what you can try:

1. Install and active this plugin:
https://wordpress.org/plugins/woocommerce-colors/
This plugins adds a new section in the Customizer, you’ll manage all WooCommerce colors, including your preferred button colors there.

2. Add the following to Appearance > Custom CSS:

/* Remove Vantage WooCommerce Button Styling */
.woocommerce #page-wrapper .button {
background: #000; /* Set this to your button background color */	
  border-top: initial;
  border-left: initial;
  border-right: initial;
  border-bottom: initial;
color: #fff !important;
cursor: pointer
  filter: initial;
  -webkit-border-radius: initial;
  -moz-border-radius: initial;
  border-radius: initial;
  -webkit-box-shadow: initial;
  -moz-box-shadow: initial;
  box-shadow: initial;
  width: initial;
  text-decoration: initial;
  /* Improves usability and consistency of cursor style between image-type 'input' and others */
  cursor: initial;
  /* Corrects inability to style clickable 'input' types in iOS */
  -webkit-appearance: none;
  line-height: initial;
  text-shadow: initial;
}
.woocommerce .button.alt,
.woocommerce .button.alt:hover {
  background: none !important;
  background-color: #9d6fce !important; /* Set this to your button background color */
  border: none !important;
}

Where I’ve said:

/* Set this to your button background color */

Change the color value next to the note to match the color value set for buttons at Appearance > Customize > WooCommerce.