header.css

header{
position: fixed;
top: 0;
right: 0;
left: 0;
bottom: auto;



}
@import url('https://fonts.googleapis.com/css?family=Poppins:400,600,700&display=swap');
/* CSS Above This Line is for Google Font Import - Do Not Copy*/

.brand-navigation {
  background-color: #06070d;
  display: flex;
  justify-content: center;
}

.content {
  width: 960px;
  height: 54px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navigation {
  list-style: none;
  margin: 0;
  display: flex;
  justify-content: flex-end;
  font-family: "Poppins", sans-serif;
  text-transform: uppercase;
  font-size: 13px;
}

.navigation a {
  text-decoration: none;
  padding: 3em;
  color: #dbdbe2;
}

.logo-nav {
  max-width: 100px;
}

.button-dark {
  height: 28x;
  padding: 1px 20px;
  border-radius: 4px;
  background-color: #00e59b;
  border-style: none;
  font-family: "Poppins", sans-serif;
  text-transform: uppercase;
  color: #FFFFFF;	
  font-size: 13px;	
  line-height: 26px;
}
.menu-header{
display: flex;
justify-content: center;
}