html {
    position: relative;
    min-height: 100%;
}

body {
    margin-bottom: 60px;
    background-position: center;
}

.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 60px;
    line-height: 60px;
    background-color: #f5f5f5;
}

.main-container {
    padding-top: 40px;
}

.loader{
    border: 5px solid #f3f3f3;
    -webkit-animation: spin 1s linear infinite;
    animation: spin 1s linear infinite;
    border-top: 5px solid #555;
    border-radius: 50%;
    width: 50px;
    height: 50px;
}

@keyframes spin{
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}