body,html  {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    overflow-y: auto; 
    height: 100%;
    overflow: auto;
}
body{
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: #193029;
}
main {
    background: #193029;
    color: #aaa;
    width: 100%;
}
label {
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
    background: #394340;
    color: #f9f0df;
    padding: 6px;
}
.spacer {
    flex: 1;
    /* 空きスペースを埋める */

}

.register-link,.login-link,.pwd-forget-link {
    display: block;
    margin-top: 20px;
    text-align: center;
    font-size: 16px;
    color: #D7BAA8;
    text-decoration: none;
    transition: color 0.3s ease;
}

.register-link:hover,.login-link:hover,.pwd-forget-link:hover  {
    color: #b23a3a;
    text-decoration: underline;
}
input {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
}

input:focus {
    border-color: #b23a3a;
    background: rgba(255, 255, 255, 0.2);
}