/* Généraux */
* {
  margin: 0;
  padding: 0;
}
html {
  font-family: sans-serif;
  font-size: 16px;
}
body {
  background: #000;
  color: #fff;
}
a {
  text-decoration: none;
  color: #00c;
}

header {
  display: block;
  padding-left: 1em;
  background: #fff;
  color: #000;
}
header h1 {
  font-size: 1.5em;
}
main {
  display: block;
  margin-top: 1em;
}

#erreur {
  background: #eee;
  color: #c00;
  font-size: 1.2em;
  margin: 0.5em;
  padding: 0 0.5em;
  border: solid 4px #f00;
}
#message_ok {
  background: #efe;
  color: #000;
  font-size: 2em;
  margin: 0.5em;
  padding: 0 0.5em;
  border: solid 4px #0f0;
  text-align: center;
}
main form {
  max-width: 30em;
  width: 90%;
  margin: auto;
  padding: 0.5em 0;
  background: #fff;
  color: #000;
}
main form fieldset {
  width: 90%;
  margin: auto;
  padding: 0.3em;
  border: inset 2px #000;
}
main form fieldset legend {
  background: #dfe;
  width: 80%;
  margin-left: 0.3em;
  padding: 0.2em 0.5em;
  border: outset 1px #000;
  border-radius: 1em;
}
main form fieldset p {
  margin-top: 0.5em;
}
main form fieldset label {
  display: inline-block;
  width: 7em;
  text-align: right;
}
main form fieldset label:after {
  content: " :";
}
main form fieldset input {
  display: inline-block;
  width: 14em;
}
main form fieldset label#lb_mes {
  text-align: left;
  width: 100%;
}
main form fieldset textarea {
  width: 95%;
  margin: 0 auto;
  height: 10em;
}
main form button {
  display: inline-block;
  font-size: 1.2em;
  margin: 0.5em 1em;
  padding: 0.2em 0.5em;
  border-radius: 0.5em;
  cursor: pointer;
}
main form button:hover {
  background: #fcc;
}

@media screen and (max-width: 400px) {
  main form fieldset label {
    width: 100%;
    text-align: left;
  }  
}