index.css

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}

header {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 5px 10px;
  margin: 10px 12pt;
  border: 2px solid black;
}

nav {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

header li {
  list-style: none;
}

a {
  text-decoration: none;
  font-size: 12px;
  color: black;
  font-weight: 600;
}

hr {
  min-height: 12px;
  border: 1px solid black;
}

.add_new {
  height: 85vh;
  margin: 10px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.list {
  height: 85vh;
  margin: 10px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.contact {
  height: 85vh;
  margin: 10px 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

form {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

input {
  width: 100%;
  padding: 5px 12px;
}

button {
  display: flex;
  align-self: flex-end;
  padding: 4px 12px;
}

.table_button {
  background-color: #f0f0f0;
  padding: 4px 12px;
  border: 1px solid black;
}

h1 {
  font-size: 18px;
  padding-bottom: 2rem;
}

h2 {
  font-size: 18px;
  padding-bottom: 2rem;
  padding-top: 4rem;
}

h3 {
  font-size: 12px;
}

footer {
  padding: 5px 10px;
  margin: 10px 12pt;
  border: 2px solid black;
}

table {
  width: 100%;
}

tr {
  display: flex;
  justify-content: space-between;
  padding: 10px 10px;
}

th {
  font-size: 12px;
  color: black;
  font-weight: 600;
}

td {
  font-size: 12px;
}

.contact_container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.contact_container h2 {
  padding-bottom: 2rem;
  padding-top: 15rem;
}

.contact_container p {
  font-size: 12px;
  padding-bottom: 1rem;
}

.contact_container ul {
  padding-left: 20%;
}

.contact_container li {
  font-size: 12px;
}

.hidden {
  display: none;
}

#date {
  font-size: 12px;
  margin-left: 62%;
}

@media screen and (min-width: 768px) {
  .add_new {
    margin: 10px 500px;
  }

  .list {
    margin: 10px 500px;
  }

  #date {
    margin-left: 90%;
  }
}