body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f8f9fa;
}
.form-container {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.form-container h1 {
    margin-bottom: 1.5rem;
}

.btn {
    font-size: 25px;
    font-weight: bold;
    margin-bottom: 20px;
}

.btn-primary {
    --bs-btn-disabled-bg: #0d6efd57;
    --bs-btn-disabled-border-color: #0d6efd57;
}

/* APIアクセス中に画面ロックするのに使うdivのスタイル */
#screenLock {
    background: rgba(0, 0, 0, 0.5);
    height: 100%;
    left: 0px;
    position: fixed;
    top: 0px;
    width: 100%;
    z-index: 2147483647;
}