* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: grid;
  place-items: center;
}

h1 {
  margin-top: 50px;
  text-align: center;
  font-size: 2.5rem;
}

table {
  margin: 1.5em 0;
  width: 50vw;
  min-width: 380px;
  border: solid 2px gray;
  border-radius: 0.4rem;
  padding: 0.3em;
}

table button {
  position: relative;
  width: 100%;
  display: inline;
  padding: 10px 30px;
  border: solid 1.5px black;
  font-size: 0.8rem;
  border-radius: 0.2rem;
  box-shadow:
    11.6px 8.2px 7.7px -2px rgba(0, 0, 0, 0.33),
    17px 12px 25px -2px rgba(0, 0, 0, 0.66);
}

td:nth-child(2) {
  width: 20%;
}

tr:nth-child(odd) {
  background-color: lightgray;
}

#add-book-btn {
  border: solid 1.5px black;
  font-size: 1.3rem;
  border-radius: 0.2rem;
  box-shadow:
    11.6px 8.2px 7.7px -2px rgba(0, 0, 0, 0.33),
    17px 12px 25px -2px rgba(0, 0, 0, 0.66);
  width: 30%;
  min-width: 80px;
  padding: 7px;
  outline: 1px solid;
  outline-color: rgba(49, 138, 172, 0.4);
  transition: all 1s cubic-bezier(0.19, 1, 0.22, 1);
}

#add-book-btn:hover {
  box-shadow: inset 0 0 20px rgba(49, 138, 172, 0.5), 0 0 20px rgba(49, 138, 172, 0.4);
  outline-color: rgba(11, 110, 149, 0);
  outline-offset: 80px;
  text-shadow: 1px 1px 6px #fff;
}

h2 {
  text-align: center;
  margin: 1em 0;
  font-size: 2.5rem;
}

form {
  line-height: 0.4em;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  width: 35vw;
  min-width: 380px;
}

input {
  width: 100%;
  font-size: 1.5rem;
}

/* nav-bar */

.nav-bar ul {
  display: flex;
  justify-content: space-around;
  list-style: none;
  width: 40vw;
}

ul li,
ul button {
  width: 100%;
}

ul li button {
  height: 2em;
  background: none;
  border-bottom: none;
  border-top: none;
}

button:hover {
  cursor: pointer;
  background-color: rgb(84, 83, 83);
  transition: all 0.5s ease;
  color: #fff;
}

ul button:first-child {
  border-left: none;
}

.nav-bar {
  margin: 0.1em 5em;
  border: solid 2px;
  display: flex;
  justify-content: space-between;
  width: 98%;
}

h3 {
  display: inline;
  margin-left: 10px;
}

.books-form,
.contact {
  display: none;
}

/* contact information */

.contact p {
  margin: 2em 0;
  font-size: 1.5rem;
}

.contact ul {
  display: grid;
  margin: 0 auto;
  font-size: 1.3rem;
  width: 80%;
}

.date {
  width: 100%;
  display: flex;
  justify-content: flex-end;
}

footer {
  width: 98%;
  border: solid;
  position: absolute;
  bottom: 15px;
}

h4 {
  margin: 0.4em;
}