My Custom.css not working -

when inspect web page encounter section element section#sp-bottom

in styles console, see

#sp-bottom (    margin: 10px 0px 0px 0px; } 

when change above 10px 0px, can see page margin of 10px disappear.

then in custom.css of template, added

#sp-bottom {    margin: 0px 0px 0px 0px; } 

but after clearing cache page & browsing history, still shows 10px

some please teach.

try increasing more specificity adding tag name(section) css selector,

section#sp-bottom {    margin: 0; }