body {
    background-color: #f5f5f5;
}

.container {
    max-width: 960px;
}

.embed-responsive {
    padding-bottom: 75%;
}

header {
    margin-bottom: 30px;
}

.my-3 {
    margin-top: 1rem !important;
    margin-bottom: 1rem !important;
}

.px-4 {
    padding-left: 1rem !important;
    padding-right: 1rem !important;
}

footer {
    margin-top: auto;
}