body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    opacity: 1; /* 透明アニメーションを削除し常に表示 */
}

.login-container {
    background-color: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); /* 控えめなシャドウに調整 */
    padding: 40px 30px;
    width: 360px;
    text-align: center;
    position: relative;
}

.login-container h1 {
    font-size: 24px;
    font-weight: 400;
    color: #202124;
    margin-bottom: 20px;
}

.login-container label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
    color: #5f6368;
    text-align: left;
}

.login-container input[type="text"],
.login-container input[type="password"] {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 8px 0 20px;
    border: 1px solid #dadce0;
    border-radius: 4px;
    font-size: 16px;
    color: #202124;
    background-color: #f8f9fa;
}

.login-container input[type="submit"] {
    background-color: #4285f4;
    color: #ffffff;
    border: none;
    border-radius: 4px;
    padding: 12px 0;
    width: 100%;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
}

.login-container input[type="submit"]:hover {
    background-color: #357ae8;
}

.saved-usernames {
    margin-top: 20px;
    text-align: left;
}

.saved-usernames label {
    font-size: 14px;
    color: #5f6368;
}

.saved-usernames p {
    margin: 6px 0;
    padding: 10px;
    font-size: 14px;
    color: #202124;
    background-color: #f1f3f4;
    border: 1px solid #dadce0;
    border-radius: 4px;
    cursor: pointer;
}

.back-button {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: #ffffff;
    border: 1px solid #dadce0;
    border-radius: 4px;
    padding: 8px 12px;
    color: #5f6368;
    font-size: 14px;
    cursor: pointer;
}

/* アニメーションを削除 */