body{ height:100vh; margin:0; }

header{ min-height:50px; background:lightcyan; }
footer{ background:PapayaWhip; margin-top:50px;}

/* Trick */
body{ 
  display:flex; 
  flex-direction:column; 
}

.container-border-text-center{
  font-weight: bold;
}

.btn-primary{
  font-weight: bold;
  background-color:#326da8;
}

.header-container {
  font-weight: bold;
}

.dropdown-menu{
  left: -50px;
}

.border-black{
  border: 1px solid black !important;
}

.btn-black {
  background: black;
  color: white;
}

.btn-outline-black {
  background: white;
  color: black !important;
  border: 1px solid black;
}

.btn-outline-black:hover,
.btn-outline-black:active,
.btn-outline-black:focus {
  background: black;
  color: white !important;
}

.btn-black:hover,
.btn-black:active,
.btn-black:focus {
    background: #222;
    color: white;
}