* {
	margin: 0;
	padding: 0;
	font-family: Sans-serif;
	box-sizing: border-box;
}
*, *::before, *::after { box-sizing: border-box; }
/*
*, *::before, *::after {
  box-sizing: border-box;
}
*/
html {
  scroll-behavior: smooth;
	box-sizing: border-box;
	overflow-x: hidden;
}
body > .background {
	background-image: url(/src/images/daniel-agudelo-jVpvSDAjvOA-unsplash.jpg);
	background-repeat: no-repeat;
	background-size: cover;
	background-position: center;
	position: fixed;
	width: 100vw;
	height: 100vh;
	z-index: -1;
	top: 0;
	overflow: hidden;
}

/*-------------- facebook ------------------*/
.facebook_wrap {
  position: absolute;
  top: 145px;
  left: 0;
	z-index: 5;
}
@media only screen and (max-width: 700px) {
	.facebook_wrap {
		display: none;
	}
}
.facebook {
  background-color: #3B5998;
  width: 100px;
  height: 75px;
  border-bottom-right-radius: 20px;
  overflow: hidden;
	box-shadow: 0 4px 18px rgba(0,0,0,0.12);
  transition: height 0.4s ease, background-color 0.2s ease;
	z-index: 10;
	box-sizing: border-box;
} 
.facebook.scrolled {
  height: 100px;
}
.facebook:hover {
  background-color: #2e4682;
}
.facebook a {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  text-decoration: none;
}
.facebook img {
  position: absolute;
  left: 50%;
  top: 10px;
  transform: translateX(-50%);
	transition: top 0.4s ease;
}
.facebook.scrolled img {
  top: 40px;
}
.facebook p {
  color: #fff;
  font-weight: bold;
  position: absolute;
  bottom: 5px;
  left: 50%;
  width: 70px;
  text-align: center;
  transform: translateX(-50%);
}



/*---------- back to top button ------------*/
#backToTop {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  background-color: #5c9dd4;
  color: #fff;
  font-size: 24px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(0,0,0,0.3);
	overflow: hidden;
  display: none;
  z-index: 1000;
	box-sizing: border-box;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}
#backToTop:hover {
  background-color: #3e97cf;
  transform: scale(1.05);
	box-shadow: 0 4px 0 rgba(0,0,0,0.5);
}


body {
	padding-top: 120px;
	overflow: hidden;
	box-sizing: border-box;
}
main {
	display: flex;
	flex-direction: column;
	gap: 100px;
	overflow: hidden;
	box-sizing: border-box;
	box-shadow: inset 20px 0 20px -20px rgba(0,0,0,1), /* left */
             inset -20px 0 20px -20px rgba(0,0,0,1); /* right */
}
a:checked,
a:link,
a:visited {
    text-decoration: none;
    color: inherit;
}