The expected behaviour on enter in a form seems to be undefined in the HTML 4.01 Specification while the HTML 5 specification says it should be the first submit button in th
Use either of these CSS Styles
a:active, a:focus,input, input:active, input:focus{ outline: 0; outline-style:none; outline-width:0; }
a:active, a:focus,button::-moz-focus-inner, input[type="reset"]::-moz-focus-inner, input[type="button"]::-moz-focus-inner, input[type="submit"]::-moz-focus-inner, input[type="file"] > input[type="button"]::-moz-focus-inner
{ border: none; }
OR
:focus {outline:none;} ::-moz-focus-inner {border:0;}
Once the CSS Style part is done, then you might also need to set the IE-Emulator. Update your web applications web.config file and include below key.