Add a responsive image

[Cray]

Hello Guys,

at first I have to say that my English is not the best .
My Question: Can I add a Picture that is responsive, because in the editor I can give the picture a height and a width in pixels. So, is it possible to change that, so that the images are responsive?

I hope anyone can help me,

Cray.

[Oleg06]

in the css file, specify the following
img {
max-width:100%;
height:auto !important;
}

[Timbow]

Delete the values for Width and Height in the Editor Image Properties panel, then either do what Oleg says, or go to the Advanced tab and add inline css or stylesheet classes