.img-bk {
    background: url('../img/bg.png');
    position: fixed;
    right: 0;
    bottom: 0;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -1000;
    opacity: 0.2;
    background-size: cover;
}

#login-panel {
    top: 50%;
    left: 50%;
    margin-right: -50%;
    transform: translate(-50%, -50%);
    max-width: 300px;
    position: absolute;
}

#login-panel form {
    padding-top: 30px;
    padding-bottom: 20px;
}

.panel {
    margin-bottom: 22px;
    background-color: #fff;
    border: 1px solid transparent;
    border-radius: 4px;
    -webkit-box-shadow: 0 1px 1px rgba(0,0,0,.05);
    box-shadow: 0
}

.panel-default {
    border-color: #d3e0e9;
}

.panel-body {
    padding: 15px;
}

.img-responsive {
    display: block;
    max-width: 100%;
    height: auto;
}

img {
    vertical-align: middle;
    border: 0;
}