body{position: relative;}div.spacer{padding-bottom: 50px;}header.intro{padding-top: 10rem; padding-bottom: calc(10rem - 72px); background: linear-gradient(to bottom right, rgba(218,214,210,0.4) 0%, rgba(124,121,118,0.95) 100%), url("../img/intro_img_sdm.jpg"); background-position: center; background-repeat: no-repeat; background-attachment: scroll; background-size: cover;}header.intro h1{font-size: 2.25rem;}@media (min-width: 970px){header.intro{height: 100vh; min-height: 40rem; padding-top: 72px; padding-bottom: 0;}header.intro p{font-size: 1.15rem;}header.intro h1{font-size: 3rem;}}@media (min-width: 1200px){header.intro h1{font-size: 3.5rem;}}#btntop{position: fixed; bottom: 20px; right: 20px; display: none; border-radius: 40px;}#btntop:hover{background-color: #555;}#contact{text-align:left;padding-top: 4px;padding-right: 4px;padding-bottom: 0;}/*#expertise{background: url("../img/proc_dev_sdm.png");background-position: center;background-repeat: no-repeat;background-attachment: scroll;background-size: auto;}*/.nav-link.active{background-color: white; color: #f4511e;}