body {
     display: flex;
     min-height: 100vh;
     flex-direction: column;
 }
 main {
     flex: 1 0 auto;
 }

.invoice-table table {
  border-collapse: collapse;
}

.invoice-table th, .invoice-table td, .invoice-table table {
  border: 1px solid black;
}

.nav-container {
  margin: 0px auto;
  max-width: 85%;
}