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Hey!

You can go to Enfold theme options > Header Layout > Header Size = Custom pixel value and decrease the height of your header.
Then you can create gradient here – http://www.colorzilla.com/gradient-editor/
and add following code to Quick CSS in Enfold theme options > General Styling tab and change the code as needed

#header_main { 
background: #1e5799;
background: -moz-linear-gradient(top,  #1e5799 0%, #2989d8 50%, #207cca 51%, #7db9e8 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#1e5799), color-stop(50%,#2989d8), color-stop(51%,#207cca), color-stop(100%,#7db9e8));
background: -webkit-linear-gradient(top,  #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%);
background: -o-linear-gradient(top,  #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%);
background: -ms-linear-gradient(top,  #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%);
background: linear-gradient(to bottom,  #1e5799 0%,#2989d8 50%,#207cca 51%,#7db9e8 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#7db9e8',GradientType=0 );
}

Regards,
Yigit

Hey!

You had gradient in your example that is why i posted you example with link and code.
Please post a screenshot and show where you would like to increase whitespace on your page. A link to your website would be helpful as well

Regards,
Yigit

Hey!

You can simply remove this code from Quick CSS/Custom.css file

#header_main {
background: #1e5799;
background: -moz-linear-gradient(top, #5eb935 0%, #719430 50%, #507210 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#5eb935), color-stop(50%,#719430), color-stop(100%,#507210));
background: -webkit-linear-gradient(top, #5eb935 0%,#719430 50%,#507210 100%);
background: -o-linear-gradient(top, #5eb935 0%,#719430 50%,#507210 100%);
background: -ms-linear-gradient(top, #5eb935 0%,#719430 50%,#507210 100%);
background: linear-gradient(to bottom, #5eb935 0%,#719430 50%,#507210 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#5eb935', endColorstr='#507210',GradientType=0 );
}

Best regards,
Yigit

Hey!

Add following code to Quick CSS

#top .av-main-nav > li.current-menu-item {
background-color: green;
}

Regards,
Yigit

Hey!

You are welcome ;)

Best regards,
Yigit