@font-face { font-family: isocteur; src: url('ISOCTEUR.ttf'); } 

* {

    box-sizing: border-box;
    margin: 0;
    padding: 0;

}

body, p, div, figure, figcaption, button {

    /*display: flex;*/
    font-family: isocteur; 
    font-size: 10px;

}

br {
    content: "";
    margin: 1em;
    display: block;
    font-size: 60%;
  }

body, figcaption, div, p, button {

    align-items: center;

}

body, button {

    justify-content: center;
    

}

html, body {
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
  }

#container-fluid {
    margin : 0;
    padding  : 0;
    /*the needed css class to make your parent div responsive to it's children's max-width
    */
    max-width: max-content;
  }

#header {

    margin: auto;
    padding  : 0;
    height : 5% ;
    display: flex;
    justify-content: space-between;
    
}


#container {
    position: relative;
    margin : 0;
    padding  : 0;
    height : 95%;
    display: block;
    background-color: white;
    
    
}


.obrazek {

   
    left:50%;
    vertical-align: middle;
    transform:translate(+39%, +0%);
    max-height : 100%;
    display: none;
    z-index: 1;
    
}

img {
    max-width:100%;
max-height:100%;
}

.popisek {

    display: block;
}


.btn {

    position: absolute;
    
    width: 50%;
    height: 100%;
    font-size: 17px;
    border: none;
    opacity: 0.0;

}

#btn1 {
    top: 0%;
    left: 50%;
    background-color: blueviolet;
}

#btn2 {
    top: 0%;
    left: 0%;
    background-color: cornflowerblue;
}

#btn3 {
    position:absolute;
    top: 0%;
    left: 50%;
    background-color:chocolate;
}

#btn4 {
    position:absolute;
    top: 0%;
    left: 0%;
    background-color:crimson;
}



#footer {
    position: absolute;
   display: flex;
    margin: auto;
    padding  : 0;
    height : 5% ;
    transform: translate(+39%, 0%);
    justify-content: space-between;
    opacity : 0.6;
    z-index: 2;
    
}

#footer2 {
    position:relative;
    height :1%;
    max-height: 5%;
}

.sipka {
    float:left;
    font-size:150%; 
    font-family : 'Trebuchet MS';
    -webkit-user-select: none; /* Safari */
    -ms-user-select: none; /* IE 10 and IE 11 */
    user-select: none;
}

button {cursor: pointer;}