header {
height: 100vh;
min-height: 600px;
display: flex;
flex-direction: column;
justify-content: center;
}
header {
height: 100vh;
min-height: 600px;
position:relative
}
.container-fluid {
left:0;
width:100%;
position: absolute;
top: 50%;
transform: translateY(-50%);
}