We can increase or decrease the width of blog border in blogger.
Follow below steps to reduce the width of blog border in blogger:
Step1: Go to blogger dashboard.
Step2: Click on template.
Step3: Click on edit HTML.
Step4: And find below code.
/* Columns
----------------------------------------------- */
.main-outer {
border-top: $(main.border.width) solid $(body.rule.color);
}
Now before “}”, write this code “margin-left: -120px !important; margin-right: -120px !important;”
Increase or decrease the px value as per your need.