.container-header {
  background-color: #FFFFFF; /* Replace with your desired color */
  background-image: none;
}

/* Example for Cassiopeia template */
.fullwidth {
    margin: 0px 0px 0px 0px;
    max-width: 100%; height: auto;
    padding-top: 30px;
    padding-bottom: 20px;
}