body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    padding: 2em;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    /* border: 1px red solid; */
    background: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
}

#startDate {
    margin-right: 1em;
}

#calculateBtn {
    padding: 0.5em 1em;
    cursor: pointer;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
}

#results {
    margin-top: 2em;
}

.plan {
    border-bottom: 1px solid #ddd;
    padding: 1em 0;
}

.date-picker {
    margin-bottom: 1em;
    display: grid;
    grid-template-columns: auto auto;
    gap: 1em;
    align-items: center;
}

.date-picker label {
    grid-column: 1 / 2;
}

.date-picker input,
.date-picker button {
    grid-column: 2 / 3;
    width: 100%;
    padding: 0.5em;
}