body,
ul,
li,
p {
  margin: 0px;
  padding: 0px;
  list-style: none;
  font-size: 1.2rem;
  font-family: Arial;
}

body {
  margin-bottom: 0px;
}

p {
  font-size: 12px;
  text-align: center;
  padding: 10px;
}

a {
  text-decoration: none;
  color: white;
  padding: 7px 20px;
  text-transform: uppercase;
  align-content: center;
  border-radius: 5px;
  font-size: 16px;
}

h1 {
  text-align: center;
  margin-top: 20px;
}

h2 {
  text-align: center;
  margin: 10px auto 20px auto;
  line-height: 1.5;
}

h3 {
  text-align: center;
  margin: 30px auto 15px auto;
  font-size: 20px;
  font-weight: 100;
  line-height: 2;
  background-image: linear-gradient(#f4f8eb 90%, #dadcec);
  padding: 20px 0;
  color: #636363;
}
h4 {
  text-align: center;
  margin-top: 0px;
  font-size: 10px;
  color: grey;
  font-weight: 100;
}

img {
  max-width: 100%;
  display: block;
}

.header {
  background: #1d1e20;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
}

.menu {
  display: flex;
}
.menu li {
  margin-left: 5px;
  font-size: 1rem;
}
.menu li a {
  display: block;
  padding: 10px 12px;
  background: #ff2003;
  align-content: center;
  border-radius: 5px;
  font-size: 13px;
}

.presentation {
  display: flex;
  flex-wrap: wrap;
  max-width: 800px;
  margin: 0 auto;
  align-content: center;
}
.presentation > div {
  flex: 1 1 300px;
  margin: 10px;
  align-items: center;
}
.presentation p {
  color: #525252;
  text-align: left;
  line-height: 1.8;
  font-size: 16px;
  margin-top: 20px;
  margin: 60px 120px 60px 120px;
}
.ilustration img {
  margin-top: -25px;
}

/* CSS FLEXBOX 1 */

.flex {
  display: flex;
  flex-wrap: wrap;
  max-width: 800px;
  margin: 0 auto;
  align-content: center;
}
.flex > div {
  flex: 1 1 300px;
  margin: 10px;
  align-items: center;
}
.flex p {
  color: #525252;
  text-align: left;
  line-height: 1.8;
  font-size: 16px;
  margin-top: 20px;
}

.footer {
  margin-top: 60px;
  margin-bottom: 0;
  display: block;
  text-align: center;
  padding: 0;
  background: #f4f8eb;
  padding: 20px;
}
.footer a {
  font-size: 10px;
  text-transform: none;
  color: #525252;
  margin: 0;
}
.footer p {
  font-size: 10px;
  text-transform: none;
  color: #525252;
  margin-bottom: -10px;
}

@media (max-width: 399px) {
  body {
    margin: 0 uto;
  }
  h1 {
    text-align: center;
    margin: 50px 0 30px 0;
  }

  h2 {
    text-align: left;
    margin: 40px 60px 40px 90px;
    line-height: 1.5;
  }
  p {
    font-size: 16px;
    text-align: left;
    padding: 10px;
    line-height: 1.8;
  }

  #center {
    text-align: center;
    margin-top: 20px;
    padding: 10px 20px;
    line-height: 1.5;
  }

  .menu li a {
    padding: 10px 8px;
  }

  .presentation p {
    color: #525252;
    text-align: left;
    line-height: 1.8;
    font-size: 18px;
    margin-top: 20px;
    margin: 60px 20px 30px 40px;
  }
}