.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  -webkit-transition: all 0.4s;
  transition: all 0.4s;
  z-index: 100;
}

.header.solid {
  background-color: rgba(18, 17, 18, 0.4) !important;
  transition: background-color 1.5s ease 0s;
}


.header-wrapper {
  padding: 15px 3rem;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  font-size: 1.4rem;
}

.nav-logo {
  width: 200px;
}

.nav-logo img {
  display: block;
  width: 100%;
}

.topbtn {
  display: inline-block;
  color: #212121;
  background-color: #ffffff;
  font-weight: 500;
  padding: 10px 25px;
  margin-left: 20px;
  transition: all 0.2s;
  border-radius: 25px;
}

.submit {
  font-weight: 700;
  background-color: #ffbc3d;
  letter-spacing: 0.1rem;
}

.topbtn:hover {
  color: #ffffff;
  background-color: #de00aa;
  transform: scale(1.1);
  box-shadow: 7px 5px 56px -14px #de00aa;
}

.topbtn:active {
  transform: scale(0.9);
}

@media (max-width:800px) {
  .header-wrapper {
    padding: 2rem 1.5rem;
  }

  .nav-logo {
    width: 180px;
  }

  .topbtn {
    font-size: 18px;
    padding: 10px;
  }
}

@media (max-width:576px) {
 
  .nav-logo {
    width: 125px;
  }

  .topbtn {
    font-size: 17px;
    padding: 6px 8px;
    margin-left: 4px;
  }

}

@media (max-width:400px) {
  .header-wrapper {
    padding: 2rem 15px;
  }

  .nav-logo {
    width: 110px;
  }

  .topbtn {
    font-size: 16px;
  }

}