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My website consists of a header and below it a container-fluid with screen information. 
The problem is that mine header is superimposing part of mine container-fluid:
HTML:
<h3 class="card-header primary-color white-text">Monitoramento</h3>
<div class="container-fluid">
  <form novalidate #f="ngForm">
    <div class="card">
    ...
CSS:
.card-header{
    height: 7%;
    text-align: center;
    position: fixed;
    width: 100%;
    z-index: 10;
}
I thought I’d add one margin-top: 7% to give the exact distance between one element and the other, but it does not seem to be sufficient, only with margin-top: 25% the correct distance between the elements is made, but as the screen increases the distance becomes very large and this impacts the visual. 
If I take the position: fixed everything works as expected, but I need this title fixed to the top.

You are using some Materialize framework or any other?
– hugocsl
material design bootstrap
– veroneseComS
Would that be? https://mdbootstrap.com/material-design-for-bootstrap/ ?
– hugocsl
that, that same
– veroneseComS