.table (td, th) {
   text-align: center;
}
.navbar {
   border: none;
   font-size: 19px;
   font-weight: 300;
}
.btn-dark {
   color: #fff;
   background-color: #343a40;
   border-color: #343a40;
 }
 
 .btn-dark:hover {
   color: #fff;
   background-color: #23272b;
   border-color: #1d2124;
 }
 
 .btn-dark:focus, .btn-dark.focus {
   box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
 }
 
 .btn-dark.disabled, .btn-dark:disabled {
   color: #fff;
   background-color: #343a40;
   border-color: #343a40;
 }
 
 .btn-dark:not(:disabled):not(.disabled):active, .btn-dark:not(:disabled):not(.disabled).active,
 .show > .btn-dark.dropdown-toggle {
   color: #fff;
   background-color: #1d2124;
   border-color: #171a1d;
 }
 
 .btn-dark:not(:disabled):not(.disabled):active:focus, .btn-dark:not(:disabled):not(.disabled).active:focus,
 .show > .btn-dark.dropdown-toggle:focus {
   box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
 }

.btn-outline-dark {
  color: #343a40;
  background-color: transparent;
  background-image: none;
  border-color: #343a40;
}

.btn-outline-dark:hover {
  color: #fff;
  background-color: #343a40;
  border-color: #343a40;
}

.btn-outline-dark:focus, .btn-outline-dark.focus {
  box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
}

.btn-outline-dark.disabled, .btn-outline-dark:disabled {
  color: #343a40;
  background-color: transparent;
}

.btn-outline-dark:not(:disabled):not(.disabled):active, .btn-outline-dark:not(:disabled):not(.disabled).active,
.show > .btn-outline-dark.dropdown-toggle {
  color: #fff;
  background-color: #343a40;
  border-color: #343a40;
}

.btn-outline-dark:not(:disabled):not(.disabled):active:focus, .btn-outline-dark:not(:disabled):not(.disabled).active:focus,
.show > .btn-outline-dark.dropdown-toggle:focus {
  box-shadow: 0 0 0 0.2rem rgba(52, 58, 64, 0.5);
}