body{
    background-color: #58b093;
}

.navbar{
    background-color: #197d5d;
    text-align: center;
    padding: 20px;
    border-radius: 10px;
    text-decoration: none;
}

.subject{
    color: #0d4d3b;
    text-decoration: none;
    font-size: 25px;
    padding: 10px;
}

.subject:hover{
    color: #58b093;
}

.intro{
    text-align: center;
    font-size: 30px;
    color: #b9e597;
    font-family:'Courier New', Courier, monospace;
    position: relative;
    top: 100px;
    background-color: #0d4d3b;
    border-radius: 10px;
    width: 500px;
    left: 120px;
    padding: 20px;
}

.button{
    background-color: #0d4d3b;  
    padding: 30px;
    position: relative;
    bottom: 100px;
    left: 800px;
    text-decoration: none;
    font-family:'Courier New', Courier, monospace;
    color: #b9e597;
    border-radius: 10px;
    font-size: 25px;
}

.button:hover{
    color: #198562;
}

h1{
    text-align: center;
    color: #0d4d3b;
    font-family:'Courier New', Courier, monospace;
}


.flashcard-container{
    display: grid;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 30px;
    grid-template-columns: repeat(5, 1fr);
    justify-items: center;
    margin: auto;
    max-width: 1200px;
}

.flashcard{
    width: 200px;
    height: 150px;
    display: flex;
    justify-content: center;
    margin-bottom: 40px;
    perspective: 1000px;
    cursor: pointer;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s;
}

.flashcard .front,
.flashcard .back{
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    background: #0d4d3b;
    border: 2px solid #198562;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0px 4px 8px rgba(0,0,0,0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    color: #b9e597;
    display: flex;
}

.flashcard .back{
    transform: rotateY(180deg);
}

.flashcard.flip .front{
    transform: rotateY(180deg);
}

.flashcard.flip .back{
    transform: rotateY(0deg);
}

.flashcard .front, .flashcard .back{
    transition: transform 0.5s;
}

.question{
    font-size: 20px;
}

.quiz{
    background: #0d4d3b;
    color: #b9e597;
    border-radius: 10px;
    padding: 10px;
    /* display: flex; */
    text-align: center;
}

.submit{
    background: #0d4d3b;
    color: #b9e597;
    border-radius: 10px;
    padding: 10px;
    text-align: center;
    position: absolute;
    left: 600px;
}

.submit:hover{
    background: #198562;
    cursor: pointer;
}

#result{
    text-align: center;
    font-size: 20px;
    font-family:'Courier New', Courier, monospace;
}