The easiest and most concrete solution would be to take advantage of a JavaScript library like jQuery, instead of using CSS code for something that simple (especially if you don't want to style it).

Regarding your assumption take a look at the link attached below. I've created a simple HTML page which points to an external jQuery library and makes use of its toggle() function. Buttons 'B' and 'C' are contained into a element, which is hidden on page load with the assistance of a CSS styling attribute. Spamming 'A' button will show and hide these two buttons in the desired vertical way.

https://jsfiddle.net/rryyy2o3/

Dear Mr. Sardor Mavlyankariev,

JQuery is easier and more effective.

Please check the links:

http://stackoverflow.com/questions/2960741/vertical-navigation-that-shows-hidden-submenu-on-click-using-jquery

http://stackoverflow.com/questions/29802818/show-hidden-submenu-onclick-jquery

Dear Mr Kontakis and Mr Chaudhuri, 

lots of thanks for your answers with indeed useful information. I am quite a beginner in this field, that's why your information is especially helpful. 

Dear sir 

Any topic and any css,html,java  and any programing topic simply coding use for this site (www.w3school.com)  and your dout and use for bootstrap is easly coding and not use of css and js.

I used on my website these instructions in a CSS file called from an HTML page and the results are very good

#banner {

height: 100px;

padding: 10px;

background-color: white;

color: white;

}

img {

width: 980px;

height: 115px;

float: left;

}

body {

margin: 20px;

font-family: sans-serif;

font-size: 16px;

width: 1000px;

text-align: center;

margin-left: auto;

margin-right: auto;

background-color: # f2f2f2;

height: 831px;

border-left: #CCC 3px double;

border-right: #CCC 3px double;

border-bottom: 3px double #CCC;

}

.list-menu {

padding: 10px;

list-style: none;

width: 180px;

font-size: 16px;

border: 1px solid rgba (0,0,0,0.8);

margin-top: 30px;

margin-left: 20px;

box-shadow: 0 0 10px rgba (0,0,0,0.9);

}

.list-menu li a {

display: block;

border-bottom: 1px solid rgba (0,0,0, 0.2);

border-top: 1px solid rgba (255,255,255, 0.2);

background: # 044698;

text-decoration: none;

color: rgb (255,255,255);

text-shadow: 0px 0px 12px rgba (0,0,0,0.5);

filter: dropshadow (color = # 000, offx = 1, offy = 0);

padding: 10px;

padding-left: 20px;

}

.list-menu li ul li a {

font-size: 15px;

color: rgb (71,104,157);

text-shadow: 1px 1px 0px rgba (255,255,255,0.5);

}

.list-menu li a: hover {

background: rgba (6,33,49,1);

-moz-transition: 0.3s ease-in background;

-webkit-transition: 0.3s ease-in background;

-o-transition: 0.3s ease-in background;

border: 1px solid rgba (0,0,0,0.3);

}

.list-menu ul {

margin: 0;

padding: 0;

list-style: none;

height: 0;

overflow: hidden;

transition: 1s;

-moz-transition: 1s;

-webkit-transition: 1s;

}

.list-menu ul li {

transition: 1s;

-moz-transition: 1s;

-webkit-transition: 1s;

}

.list-menu li: hover ul {

height: 120px;

overflow-y: auto;

overflow-x: hidden;

background: # 0069B4;

}

.list-menu ul li a {

background: rgb (250,250,250);

}

.list-menu ul li a: hover {

color: # 0069B4;

-moz-transition: Color 0.4s ease;

-webkit-transition: Color 0.4s ease;

-o-transition: Color 0.4s ease;

text-shadow: 2px 0px 0px rgba (0,0,0,0.7);

}

#right {

float: left;

width: 140px;

padding-right: 10px;

border-style: dashed;

border-width: 2px;

border-radius: 5px 5px 25px 25px;

}

# right1

{

float: right;

width: 550px;

padding-right: 10px;

text-align: left;

/ * Font: Arial, Helvetica, sans-serif; size: 3; color: # 000000; text-align: justify; * /

}

# right11

{

float: right;

width: 750px;

padding-right: 10px;

font: Arial, Helvetica, sans-serif; size: 3; color: # 000000; text-align: justify;

border-style: dashed;

border-color: # 043477;

border-width: 2px;

border-radius: 5px 5px 5px 5px;

}

# Container-foot {

width: 63%;

background: #CCC;

position: absolute;

bottom: 0;

/ * Bottom: -1px; * /

height: 39px;

font-size: 10px;

}

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