html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
    position: relative;
    height: 100%;
    width: 100%;
}


.center-container {
    position: absolute;
    height: 100%;
    width:100%;
    text-align:center;      
}

.center {
    margin: 0;
    position: absolute;
    top: 30%;
    -ms-transform: translateY(-30%);
    transform: translateY(-30%);
    left: 50%;
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
    border-block-color:red;
}

.center-vertical {
    margin: 0;
    position: absolute;    
    width: 100%;
    height: 80%;
    top: 40%;
    -ms-transform: translateY(-30%);
    transform: translateY(-30%);
}

.center-horizontal {
    margin: 0;
    position: absolute;    
    left: 50%;
    -ms-transform: translateX(-50%);
    transform: translateX(-50%);
}