@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');
.main-title {
  position: absolute;
  margin: 0;
  padding: 0;
  color: #f9f1e9;
  text-align: center;
  top: 50%;
  left: 50%;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}
.demo-1 .main-title {
  text-transform: uppercase;
  font-size: 4.2em;
  letter-spacing: 0.1em;
}
.main-title .thin {
  font-weight: 200;
}
@media only screen and (max-width: 768px) {
  .demo-1 .main-title {
    font-size: 3em;
  }
}
* {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
}

body {
  font-family: 'Roboto', sans-serif;
}

.sidebar {
  position: fixed;
  left: -250px;
  width: 250px;
  height: 100%;
  background: #042331;
  transition: all .5s ease;
}

.sidebar header {
  font-size: 22px;
  color: #fff;
  text-align: center;
  line-height: 70px;
  background: #063146;
  -moz-user-select: none;
}

.sidebar ul a {
  display: block;
  height: 100%;
  width: 100%;
  line-height: 65px;
  font-size: 20px;
  color: #fff;
  padding-left: 40px;
  box-sizing: border-box;
  border-top: 1px solid rgba(233, 226, 226, 0.1);
  border-bottom: 1px solid #000;
  transition: .4s;
}

ul li:hover a {
  padding-left: 50px;
}

.sidebar ul a i {
  margin-right: 16px;
}

#check {
  display: none;
}

label #btn, label #cancel {
  position: absolute;
  cursor: pointer;
  background: #3B3B3B;
  border-radius: 3px;
}

label #btn {
  left: 40px;
  top: 25px;
  font-size: 35px;
  color: #FFFFFF;
  padding: 6px 12px;
  transition: all .5s ease;
}

label #cancel {
  z-index: 1111;
  left: -195px;
  top: 17px;
  font-size: 30px;
  color: #0a5275;
  padding: 4px 9px;
  transition: all .5s ease;
}

#check:checked ~ .sidebar {
  left: 0;
}

#check:checked ~ label #btn {
  left: 250px;
  opacity: 0;
  pointer-events: none;
}
#check:checked ~ label #cancel {
  left: 195px;
}

#check:checked ~ section{
  margin-left: 250px;
}

section {
  background-image: url('bg1.jpg')  ;
  background-position: relative;
  background-size: cover;
  height: 90%;
  width: 110%;
  transition: all .5s;
}

@media screen and (max-width: 500px) {
  section {
    padding: 200px 100px;
  }
}