body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.jumbotron {
  padding: 80px;
  margin-bottom: -20px; 
  background: #3A7CF4;
  background: linear-gradient(344deg, rgba(0,20,36,1) 0%, rgba(9,75,121,1) 30%, rgba(0,215,255,1) 100%);
  background-size: cover;
}

footer {
  margin-top: auto;
}

.divjumbo {
    display: flex;
    justify-content: center;
}
.imgjumbo {
  width: 100%;
}