body {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0;
    padding: 10px;
    box-sizing: border-box;
    line-height: 1.3;
    font-family: Arial, sans-serif;
    justify-content:center;
    /*max-width: 900px;*/
}

.input-section {
    flex: 1 1 25%;
    max-width: 25%;
}

.input-line {
    margin: 0 0 20px 0;
    background-color: aliceblue;
    border-radius: 5px;
    padding: 5px 0 5px 5px;
}

.input-point {
    margin: 0 0 20px 0;
    background-color: floralwhite;
    border-radius: 5px;
    padding: 5px 0 5px 5px;
}

.input-line-intro, .input-point-intro {
    margin: 0 0 6px 0;
}

input[type="checkbox"] {
    width: 20px; 
    height: 20px;
    margin: 0 10px 0 0;
    padding: 0;
}

.graph-section {
    flex: 1 1 40%;
    max-width: 40%;
}

canvas {
    border: 2px solid #333;
    width: 100%;
    height: auto;
    background-color: #f9f9f9;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

input {
    margin: 5px 0;
    width:4em;
    font-size: 1rem;
}

/*
button {
    background-color: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
    padding: 10px 20px;
    border-radius: 5px;
}

button:hover {
    background-color: #0056b3;
}
*/

@media (max-width: 768px) {
    .input-section, .graph-section {
        flex: 1 1 100%;
        max-width: 100%;
    }

    h1 {
        font-size: 1.2rem;
    }
}