body {
  margin: 0;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  border-bottom: 1px solid black;
  background-color: white;
}

nav {
  padding-top: 10px;
  padding-bottom: 10px;
  padding-right: 10px;
  width: 90%;
  margin: 0 auto;
}

nav a {
  font-size: 1.7em;
}

nav a{
  text-decoration: none;
}

nav a:visited {
  color: black;
  text-decoration: none;
}

.new-entry {
  display: block;
  float: right;
}

button {
  border: 1px solid black;
}

.container{
  margin-top: 51px;
}

.contain {
  display: flex;
  justify-content: space-between;
}

.filter {
  margin-bottom: 20px;
  padding: 10px;
  border-bottom: 1px solid black;
}

.filter ul {
  list-style-type: none;
  padding: 0;
}

.filter li {
  display: inline;
}

.item {
  border: 1px solid black;
  padding: 10px;
  width: 90%;
  margin: 0 auto;
  margin-bottom: 20px;
}

.item img {
  width: 80%;
  display: block;
  margin: auto;
}

.new-entry-form, h2 {
  width: 90%;
  margin: 0 auto;
}

.new-entry-form {
  padding: 5%;
}

form input{
  width: 100%;
  line-height: 25px;
  margin-bottom: 3%; 
  border: 1px solid black;
}

form label {
  margin-bottom: 1%;
}

form button {
  width: 90px;
  height: 30px;
}

label, form button{
  display: block;
}