html - Make my image full width -

how edit in css

.container, .navbar-static-top .container, .navbar-fixed-top .container,     .navbar-fixed-bottom .container {   width: 1170px; } 

the website http://insightcxo.com/test-2

i want make image full width or 1230px

this code have in editor

.page-id-731 .container { width: 1230px; } 

thanks!

img { width:100%; max-width: 100%; } should work you.