customize bloggers template margins

Remove outer body margin from bloggers template :

Search the two element code given below and change its value to 0. the outer white margin from your template will be removed.

content.padding
content.padding.horizontal

Customize/remove header margin from bloggers template:

Add the given code blow to the css segments of bloggers template just above   ]]></b:skin>

#header { margin:0px; } 
.header .widget { margin:0px;}

Remove or customize the footer margin from bloggers template:

Add this three piece of code to  the css segments of bloggers template just above   ]]></b:skin>

.footer-inner { padding: 0px; margin: 0px;}
.foot { margin: 0px 0 0 0;}
.foot .widget { margin: 0px 0 0 0;}

Remove widget margin from mobile template :

Add the given code blow to the css segments of bloggers template just above   ]]></b:skin>

html .header-outer { margin: 0px}
html .main-outer {margin: 0px;}