header {
  width: 100%;
  background: #4E94AC !important;

}

#btn-menu {
   display: none;
}
header label {
  display: none;
  width : 30px;
  height: 30px;
  padding : 1px;
  border-right: 1px solid #fff;
}

header label:hover {
cursor: pointer;
background: rgba(0,0,0,0.3);
}

.menu ul {
  margin: 0;
  list-style: none;
  padding:0;
  display: flex;
  justify-content: center;
}

.menu li:hover {
   background: rgba(0,0,0,0.3);
}

.menu li a {
display: block;
padding: 15px 20px;
color: #fff;
text-decoration: none;
}

main {
  padding: 0px;
}

@media (max-width:768px) {
  header label{
    display: block;
  }

.menu {
    position :absolute;
    background: #4E94AC;
    width: 70%;
    margin-left: -70%;
    transition: all 0.5s;
  }
.menu ul {
    flex-direction: column;
  }
.menu li {
    border-top: 1px solid #fff;
  }

#btn-menu:checked ~ .menu {
      margin: 0;
  }

}