.input-group-addon {
    padding: 7px 12px;
    font-size: 12px;
    font-weight: normal;
    line-height: 1;
    color: mediumpurple;
    text-align: center;
    background-color: LightGreen;
    border: 1px solid #ddd;
    border-radius: 3px;
}

.circle-icon {
    display: inline-block;
    margin: 20px auto;
    background: LightGreen;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    box-shadow: 0px 0px 2px #888;
    text-align: center;
    vertical-align: middle;
    padding: 35px;
    color: mediumblue;
}

.bg-slate-800 {
    background-color: #37474F;
    border-color: #37474F;
}

.content-group-lg {
    margin-bottom: 30px !important;
}

body.bg-slate-800 {
    background-image: url(/images/bg.png);
    background-size: contain;
}

div.full-width {
    width: 100%;
}

.card {
    width: 300px;
    margin: 0 auto;
}

.error-message {
    color: red;
    text-align: center;
}

.login-footer {
    position: relative !important;
    
    margin-top: 50px !important;
    margin-bottom: 20px !important;
    font-size: 12px !important;
    
}

    .login-footer p {
        margin-bottom: 2px !important;
    }

.login-form {
    min-height: 75vh !important; /* 佔據視窗 75% 的高度，把 footer 擠下去 */    
}