* {
margin: 0;
padding: 0;
font-family: tahoma;
box-sizing: border-box;
}
p {
font-size: 18px;
}
header {
background-color: #F63232;
padding: 20px 0;
text-align: center;
position: fixed;
width: 100%;
top: 0;
left: 0;
z-index: 1;
}
header h1 {
color: white;
border: 8px solid white;
display: inline-block;
padding: 6px 12px;
border-radius: 36px;
}
.banner {
position: relative;
}
.banner img {
max-width: 100%;
}
nav {
background: #F4F4F4;
padding: 20px;
position: sticky;
top: 106px;
z-index: 1;
}
nav ul {
white-space: nowrap;
max-width: 1200px;
margin: 0 auto;
text-align: center;
}
nav li {
width: 25%;
display: inline-block;
font-size: 24px;
}
nav li a {
text-decoration: none;
color: #4B4B4B;
}
nav li a:hover {
text-decoration: underline;
}
nav li a.join {
color: #F63232;
}
main {
max-width: 100%;
width: 1200px;
margin: 80px auto;
padding: 0 40px;
box-sizing: border-box;
}
article h2 {
color: #F63232;
font-size: 48px;
}
article p {
line-height: 2em;
color: #4B4B4B;
}
article p::first-line {
font-weight: bold;
font-size: 1.2em;
}
.images {
text-align: center;
margin: 80px 0;
white-space: nowrap;
}
.images li {
display: inline-block;
list-style-type: none;
width: 40%;
margin: 20px 5%;
position: relative;
}
.images li:hover {
top: -4px;
}
.images li img {
width: 90%;
}
section.join {
background: #F4F4F4;
text-align: center;
padding: 60px 20px;
color: #4B4B4B;
}
section.join h2 {
font-size: 36px;
}
form input {
margin: 20px 0;
padding: 10px 20px;
font-size: 24px;
border-radius: 28px;
border: 4px solid white;
}
form input:focus {
border: 4px dashed #4B4B4B;
outline: none;
}
form input:valid {
border: 4px solid #71D300;
}
#submit {
cursor: pointer;
}
footer {
background: #F63232;
color: white;
padding: 20px;
text-align: center;
font-size: 20px;
}
/* responsive styles */
@media screen and (max-width: 1400px) {
.banner .welcome {
  font-size: 40px;
}
}
@media screen and (max-width: 960px) {
.banner .welcome {
  font-size: 28px;
}
nav li {
  font-size: 18px;
}
}
@media screen and (max-width: 700px) {
.banner .welcome {
  font-size: 20px;
  position: relative;
  text-align: center;
}
.banner .welcome br {
  display: none;
}
.banner .welcome span {
  font-size: 1em;
}
nav li {
  font-size: 18px;
}
.images li {
  width: 100%;
  display: block;
  margin: 20px auto;
}
}
@media screen and (max-width: 560px) {
.banner .welcome {
  font-size: 20px;
  position: relative;
  text-align: center;
}
.banner .welcome br {
  display: none;
}
.banner .welcome span {
  font-size: 1em;
}
nav li {
  display: block;
  width: 100%;
  margin: 12px 0;
}
article h2 {
  font-size: 36px;
}
header,
nav {
  position: relative;
  top: 0;
}
}