I created a basic format responsive only with HTML and CSS.
Four patterns of 1 column, 2 columns (left menu or right menu), 3 columns (both ends menu) are achieved by switching the css class.
When it comes to smartphone size, the side menu is displayed on the lower side.
It is a simple way to make a circle with just HTML and CSS without using images etc., making it very easy.
Since it is not necessary to read the image, response time and page display time can be shortened very slightly.
It is a way to make a balloon with only HTML and CSS without using images etc.
Since it is not necessary to read the image, response time and page display time can be shortened while minimizing.
A "position" property that changes the position of HTML elements in CSS. However,
if you know only "absolute" and "relative" to designate the absolute position and to specify the relative position, the displayed content of the page may be greatly destroyed.
I will explain the behavior of the position property to prevent it.
It is a way to customize quotes, background colors, etc. when using quotes. I will do it in CSS.