#btn {
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  border: none;
  outline: none;
  background-color: rgb(7, 228, 125);
  cursor: pointer;
  padding: 15px;
  border-radius: 10px;
  font-size: 18px;
}

#btn:hover {
  background-color: #555;
}

header {
background-color: rgb(0, 124, 6);
position: fixed;
left: 0;
right: 0;
top: 5px;
height: 30px;
display: flex;
align-items: center;
box-shadow: 0 0 25px 0 black;
}

header * {
display: inline;
}

header li {
margin: 20px;
}

header li a {
color: rgb(255, 255, 255);
text-decoration: none;
}

body{
background-repeat: no-repeat;
background-attachment: fixed;  
background-size: cover;
color: gainsboro;
font-family: system-ui;
}

.team-container {
display: flex; /* or inline-flex */
justify-content: space-around;
}

.main {
margin-left: 15%;
margin-right: 15%;
background-color: rgba(27, 27, 27, 0.749);
padding-left: 1%;
padding-right: 1%;
padding-top: 1%;
padding-bottom: 1%;
}

ul.nav {
    padding-left: 0px;
    background-color: #a1f39e;
    text-align: center;
    font-size: 25px;
  }
  ul.nav > li {
    display: inline-block;
    padding: 10px 20px;
  }
  ul.nav > li:hover {
    background-color: #7c7b7b;
  }
  ul.nav > li > a {
    color: rgb(0, 0, 0);
    text-decoration: none;
  }

.title{
    text-align: center;
}