body {
    background-color: #2c5d89;
}

.top-nav {
    width: 100%;
}
.top-nav-title {
    margin: 0 auto;
    width: 280px;
}
.top-nav-title a {
    display: block;
    font-size: 4rem;
    text-align: justify;
    text-align-last: justify;
    color: #000;
    text-shadow: #fff 0 0 10px, #fff 0 0 10px, #fff 0 0 10px, #fff 0 0 10px, #fff 0 0 10px;
}
.top-nav-title p {
    display: block;
    border-radius: 5px;
    padding: .2rem 2rem;
    font-size: 12px;
    text-align: center;
    color: #fff;
    background-color: #222;
    box-shadow: 0px 0px 10px #fff;
}

.login-container {
    margin: 0 auto;
    padding: 0;
    width: 300px;
    color: #fff;
}
.login-container h4 {
    margin-bottom: 1rem;
    font-weight: bold;
    color: #fff;
    text-align: center;
}
.login-container fieldset {
    border: 5px solid #fff;
    border-radius: 5px;
    padding: 2rem;
    padding-top: 1rem;
}
.login-container label {
    margin-bottom: 0;
}
.login-container [type="submit"] {
    width: 100%;
    color: #000;
    background-color: #ffc734;
    border-color: #ffc734;
}
.login-container .button {
    width: 100%;
}

/* フッターを最下部に固定する */
html
,body {
    min-height: 100vh;
}
body {
    display: flex;
    flex-direction: column;
}
main {
    flex: 1;
}

footer {
    padding: 1rem;
    width: 100%;
    color: #fff;
}
footer p {
    text-align: center;
}