nav {
  margin: 6px auto;
  max-width: 700px;
  width: 95%;
  font-family: 'Fredoka One', cursive;
  z-index: 1;
}

#checkbox1,
.toggle {
  display: none;
}

.menu {
  padding: 0;
  margin: 0;
  max-width: 700px;
  height: 50px;
  border-radius: 5px;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
  list-style-type: none;
}

.menu li a {
  text-decoration: none;
  align-self: center;
  border-radius: 5px;
  font-size: 28px;
  margin:0 8px;
  padding: 10px 10px;
  transition: background .2s linear;
}

@media screen and (max-width: 1240px) {
  .menu li a {
    font-size: 22px;
    margin:0 4px;
  }
}

@media screen and (max-width: 960px) {
  .menu li a {
    font-size: 16px;
  }
}

@media screen and (max-width: 748px) {
  .menu li a {
    font-size: 12px;
    margin:0 2px;
  }
}

@media screen and (max-width: 550px) {
  .toggle {
    clear: both;
    display: block;
    text-align: center;
    font-size: 14px;
    line-height: 40px;
    cursor: pointer;
    width: 100%;
    height: 40px;
    font-size: 30px;
    color: white;
    border-radius: 5px;
    transition: all .1s linear;
    background-color:#4c5f7b;
    margin:62px 0 0 0;
  }
  .toggle:hover {
    background: #F1006A;
  }
  #checkbox1:checked + label .demo li {
    opacity: 1;
    visibility: visible;
    transition: all .7s linear;
  }

  #checkbox1:checked + label .demo {
    height: 200px;
  }
  .menu {
    border-radius: 0px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    height: 0px;
    transition: height .3s linear;
  }
  .menu li {
    display: flex;
    /* magic */
    align-self: center;
    width: 95%;
    opacity: 0;
    visibility: hidden;
  }
  .menu li a {
    width: 95%;
    text-align: center;
    align-self: center;
    align-content: center;
    margin:2px auto;
    font-size:24px;
  }
}

.demo {

}

.demo li a {
  color: #fff;
  z-index:1;
    background:#4c5f7b;
}

.demo li a:hover {
  background: #F1006A;
}