style.css

@font-face {
    font-family: SaiyanSans;
    src: url(db/Saiyan-Sans.ttf);
}

html{
    height: 100%;
}

body {
    text-align: center;
    background: url("db/pozadina.jpg") no-repeat center center fixed; 
    background-size: cover;  
    height: 100%;

}

h1 {
    color: orange;
    font-size: 64px;
    font-family: SaiyanSans;
}

form {
    max-width: 350px;
    margin: auto;
}

form label, p, span {
    color: orange;
}

button {
    margin: 5px;
}

#board {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    position: relative;
    width: 70%;
    margin: auto;   
    perspective: 1000px;      
}

.memoryCard{
    position: relative;
    flex-basis: 16%;
    transition: transform 0.5s;
    transform-style: preserve-3d;
}

.memoryCard:hover{
    cursor: pointer;
}

.cardFront,
.cardBack {
    width: 100%;
    padding: 5px;
    border-radius: 50%;
    backface-visibility: hidden;
}

.cardFront{
    position: absolute; 
    transform: rotateY(180deg);
}

.cardBack{
    position: relative;  
}

@media screen and (max-width:1200px){
    #board{
        width: 80%;
    }
    .cardFront,
    .cardBack{
        padding: 2px;
        margin-bottom: 10px;
    }
}

@media screen and (max-width:768px){
    #board{
        width: 100%;
    }   
}

.rotate {
    transform: rotateY(180deg);
}

p{
    display: inline-block;
    margin: auto;
    padding: 0px 20px;    
}

#overlay{
    position: fixed; 
    display: none; 
    width: 100%; 
    height: 100%; 
    top: 0; 
    left: 0;    
    background-color: rgba(0,0,0,0.5);
    z-index: 2; 
    cursor: pointer;     
}

#endGame{
    position: fixed;
    top: 50%;
    left: 50%;
    font-size: 15vw;  
    transform: translate(-50%,-50%);
    font-family: SaiyanSans;  
}