*{margin:0;padding:0;box-sizing:border-box;font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;}

:root{
    --fundoCol:#37474F;
    --mcol0:#29B6F6;
    --mcol1:#2196F3;
    --mcol2:#1976D2;
    --txtcol0:#90A4AE;
    --txtcol1:#607D8B;
    --whitecol:#ECEFF1;
    --escuraCol:#263238;
}


body{
    display: flex;
    flex-direction:column;
    align-items: center;
    padding-top: 15vh;
    background-color: var(--fundoCol);
}

#puzzle_container{
    position: relative;
    width: 50vh;
    height: 50vh;
    background-color: var(--escuracol);
    border-radius: 8px;
    border: 1px solid var(--mcol0);
    box-shadow: 0px 8px 0px var(--mcol0);
}

.puzzle_block{
    position: absolute;
    left: 0;
    top: 0;
    width: 33.4%;
    height: 33.4%;
    background-color: var(--txtcol1);
    color: var(--whitecol);
    font-size: 10vh;
    font-weight: bold;
    text-align: center;
    padding-top: 3%;
    cursor: pointer;
    user-select: none;
    transition:left 0.3s,top 0.3s;
    
}

/*difficulty container*/
#difficulty_container{
    display: flex;
    flex-direction: row;
    width: 50vh;
    height: 10vh;
    background-color: var(--escuraCol);
    border-radius: 8px;
    margin-top: 22px;
    
}
.difficulty_button{
    flex-grow: 1;
    background-color: inherit;
    color: var(--mcol2);
    text-align: center;
    font-size: 3vh;
    font-weight: bold;
    padding-top: 5%;
    margin: 4%;
    cursor: pointer;
    transition: font-size 0.3s;
    
}
.difficulty_button:hover{
    opacity: 0.8;
    font-size: 3.5vh;
}
.difficulty_button.active{
    background-color:inherit;
    color: var(--mcol0);
}