main.css

body{
  margin: 0;
  font-family: sans-serif;
}
ul li{
  list-style: none;
display: inline;
padding-right: 10px;
padding-left: 10px;
}

header{
  position: relative;
  top: 0;
  text-align: right;
  margin-right: 20px;
}
img{
  height: 200px;
  display: block;
  margin-top: 100px;
  margin-left: auto;
  margin-right: auto;
}

input[type='text']{
  display: block;
  margin: 10px auto;
  font-size: 16px;
  padding: 7px;
  width: 300px;
}

input[type='submit']{
  padding: 4px 10px;
  border-radius: 4px;
}
input[type='submit']:hover{
  cursor: pointer;
}

.center{
   text-align: center;
}

footer{
  position: fixed;
  bottom: 0;
  width: 100%


}

.left{
  float: left;
}
.right{
  margin-right: 20px;
  text-align: right
}

a{
  color: black;
  text-decoration: none;
}
a:hover{
  text-decoration: underline;
}