<div class="navigation">
      <input type="checkbox" class="navigation__checkbox" id="nav-toggle">
      <label for="nav-toggle" class="navigation__button">
        <span class="navigation__icon" aria-label="toggle navigation menu"></span>
      </label>
      <div class="navigation__background"></div>

      <nav class="navigation__nav" role="navigation">
        <ul class="navigation__list">
          <li class="navigation__item">
            <a href="#" class="navigation__link"><span>01</span>Sobre</a>
          </li>
          <li class="navigation__item">
            <a href="#" class="navigation__link"><span>02</span>Habilidades</a>
          </li>
          <li class="navigation__item">
            <a href="#" class="navigation__link"><span>03</span>Trabalhos</a>
          </li>
          <li class="navigation__item">
            <a href="#" class="navigation__link"><span>04</span>Eventos</a>
          </li>
          <li class="navigation__item">
            <a href="#" class="navigation__link"><span>05</span>Contato</a>
          </li>
    </ul>
  </nav>
  <span id="by">&copySthéffaneNunes</span>
</div>

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100vh;
}

body {
  background-color: #C1D0D0;
  font-family: Roboto, Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

.navigation__checkbox {
    display: none;
}

.navigation__button {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    height: 5rem;
    width: 5rem;
    text-align: center;
    background-color: #fff;
    border-radius: 50%;
    z-index: 300;
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

@media screen  and (min-width: 768px) {
    .navigation__button {
        top: 4rem;
        right: 4rem;
        height: 7rem;
        width: 7rem;
    }
}

.navigation__background {
    position: fixed;
    top: 2rem;
    right: 2rem;
    height: 3rem;
    width: 3rem;
    border-radius: 50%;
    background: #4A676A;
    background-size: cover;
    background-position: center;
    z-index: 100;
    transition: all 800ms cubic-bezier(0.86, 0, 0.07, 1);
}

@media screen and (min-width: 768px) {
    .navigation__background {
        top: 4.5rem;
        right: 4.5rem;
        height: 6rem;
        width: 6rem;
    }
}

.navigation__nav {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    opacity: 0;
    width: 0;
    visibility: hidden;
    z-index: 200;
    transition: all 800ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.navigation__list {
    /*@include center;*/
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    width: 100%;
    list-style: none;
}

.navigation__item {
    margin: 1rem;
}

.navigation__link:link,
.navigation__link:visited {
    display: inline-block;
    padding: 1rem 2rem;
    text-transform: uppercase;
    color: #f4f4f4;
    font-size: 2.4rem;
    text-decoration: none;
    transition: all .2s;
}

@media(min-width: 768px) {
    .navigation__link:link,
    .navigation__link:visited {
        font-size: 3.8rem;
    }
}

.navigation__link span {
    margin-right: 1.5rem;
    display: inline-block;
}

.navigation__link:hover {
    color: #C1D0D0;
    transform: scale(1.1);
}

.navigation__checkbox:checked~.navigation__background {
    transform: scale(80)
}

.navigation__checkbox:checked~.navigation__nav {
    width: 100%;
    visibility: visible;
    opacity: 1;
}

.navigation__icon {

    position: relative;
    margin-top: 2.5rem;
}

@media screen and (min-width: 768px) {
    .navigation__icon {
        margin-top: 3.5rem;
    }
}

.navigation__icon,
.navigation__icon::before,
.navigation__icon::after {
    display: inline-block;
    width: 2.2rem;
    height: 2px;
    background-color: #4A676A;
}

@media (min-width: 768px) {
    .navigation__icon,
    .navigation__icon::before,
    .navigation__icon::after {
        width: 3rem;
    }
}

.navigation__icon::before,
.navigation__icon::after {
    content: '';
    position: absolute;
    left: 0;
    transition: all 200ms;
}

.navigation__icon::before {
    top: -.8rem;
}

.navigation__icon::after {
    top: .8rem;
}

.navigation__button:hover .navigation__icon::before {
    top: -1rem;
}

.navigation__button:hover .navigation__icon::after {
    top: 1rem;
}

.navigation__checkbox:checked+.navigation__button .navigation__icon {
    background-color: transparent;
}

.navigation__checkbox:checked+.navigation__button .navigation__icon::before {
    top: 0;
    transform: rotate(135deg);
}

.navigation__checkbox:checked+.navigation__button .navigation__icon::after {
    top: 0;
    transform: rotate(-135deg);
}



/*-----------------------*/
#by {
  font-family: 'Arima Madurai', cursive;
  color: #4A676A;
  font-size: 10px;
  position: absolute;
  top: 22%;
  right: 2.5%; 
}

/*
light-blue: #C1D0D0;
dark-blue: #4A676A;
cream: #FFEAA5;
yellow: #FFB037;
*/