header:not(.fixed-header) .custom-header {
    background: transparent !important;
}

.fixed-header .custom-header {
    padding: 0 !important;
}

.custom-header {
    transition: all .3s ease-in-out ;
    -webkit-transition: all .3s ease-in-out 
}
.parent1 {
  border: 0px solid black;
  margin: 1rem;
  padding: 1rem 1rem;
  text-align: center;
}
.child1 {
  display: inline-block;
  border: 0px solid red;
  padding: 1rem 1rem;
  vertical-align: middle;
}