body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    padding: 20px;
    box-sizing: border-box;
}

#app {
    width: 100%;
    max-width: 600px;
    text-align: center;
}

#passwordPrompt {
    margin-bottom: 20px;
}

#password {
    width: 100%;
    max-width: 200px;
    padding: 10px;
    margin-bottom: 10px;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

#content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#heartRateContainer {
    margin-bottom: 20px;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

#heartRate {
    font-size: 48px;
    margin: 20px 0;
}

#chartContainer {
    width: 100%;
    height: 50vh;
    max-height: 300px;
}

@media (max-width: 480px) {
    h1 {
        font-size: 20px;
    }

    #heartRate {
        font-size: 36px;
    }

    #chartContainer {
        height: 40vh;
    }
}

canvas {
    position: relative;
    width: 80% !important;
    height: 70% !important;
}