body {
background-image: url(../images/wasser.jpg);
background-repeat: no-repeat;
background-size: cover;
background-color: #f9fafb;
}

.container-header {
position: relative;
z-index: 10;
margin-bottom: 20px;
background-color: #f9fafb;
background-image: linear-gradient(135deg, #f9fafb 0%, #f9fafb 100%);
box-shadow: 0 5px 5px rgba(0, 0, 0, 0.03) inset;
}