body {
    padding-top: 50px;
}
.jumbotron {
  height: 400px;
  color: #ffffff;
  width: 100%;
}

.alpha70 {
    /* RGBa with 0.7 opacity */
    background-color: rgba(0, 0, 0, 0.7);
}

.bg-light {
    background-color: #ffffff;
}

.bg-medium {
    background-color: #f1f1f1;
}

section {
    min-height: 400px;
    margin-top: -50px;
    padding-top: 50px;
    padding-bottom: 100px;
}

footer {
    padding: 10px;
    background-color: #f6f6f6;
}

.footer {
    margin-left: auto;
    margin-right: auto;
    max-width: 1170px;
}