* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #d6d6d6;
}

.login-container {
    width: 300px;
    padding: 20px;
    background-color: #eff0ef;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.2);
    border-radius: 8px;
    text-align: center;
}

.login-container img {
    width: 200px; /* ロゴのサイズ調整 */
    margin-bottom: 20px;
}

.login-container h1 {
    margin-bottom: 20px;
    color: #757575;
    font-size: 1.5em;
}

.login-container input[type="text"],
.login-container input[type="password"] {
    width: 100%;
    padding: 10px;
    margin: 0 auto 0.3em;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.login-container input[type="submit"] {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    background-color: #3160ad;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.login-container input[type="submit"]:hover {
    background-color: #284f8d;
}