*{
    box-sizing: border-box;
}
body{
    background-color: #0095dd;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    min-height: 100vh;
}
canvas{
    background-color: #f0f0f0;
    display: block;
    border-radius: 5px;
}
.btn{
    cursor: pointer;
    border: 0;
    padding: 10px 20px;
    background: #000;
    color: #fff;
    border-radius: 5px;
}
.btn:focus{
    outline: 0;
}
.btn:active{
    transform: scale(0.98);
}
.btn:hover{
    background-color: #222;
}
.rules-btn{
    position: absolute;
    top:30px;
    left:30px;
}
.rules{
    position: absolute;
    top:0;
    left:0;
    background: #333;
    width: 400px;
    padding: 20px;
    line-height: 1.5;
    min-height: 100vh;
    color: #fff;
    transform: translateX(-500px);
    transition: transform 0.2s ease-in-out;
}
.rules.show{
    transform: translateX(-10px);
}


/* Popup */
.popup, .score-card{
   position: absolute;
   top:50%;
   transform: translateY(-50%);
   background-color: black;
   color: #fff;
   padding: 20px;
   width: 300px;
   height: 200px;
   border-radius: 10px;
   transition: all 0.5s ease-in-out;;
}
.popup.hide{
 transform: translateY(-700px);
}
.popup h1{
    text-align: center;
}
.score-card{
    position: absolute;
    top:-200px
}
.score-card.show{
    top:50%;
    transform: translatey(-50%);
}
.start-game{
   padding: 10px 20px;
   position: absolute;
   left:50%;
   transform: translateX(-50%);
   /* transform-origin: center; */
   font-size: 20px;
}
.start-game:focus{
    outline: 0;
    
}
.start-game:active{
    transform: scale(0.98) translateX(-50%);
}
.play-again{
    top: 100px;
}