styles.css

body{
  background-color:black;
  color:white;
  width: 100%;
  height: 100vh;
  margin: 0;
  font-size: 16px;
}
h1,p{
  text-align:center;
  margin: 1em auto;
}
form{
  background-color: #1b1b32;
  width: 60vw;
  max-width: 500px;
  min-width: 300px;
  margin: 0 auto;
  padding: 2em ;
}
label {
  display: block;
  margin: 0.5rem 0;
}
fieldset {
  border: none;
  padding: 2rem 0;
  border-bottom: 3px solid #3b3b4f;
}
input,
textarea,
select {
  margin: 10px 0 0 0;
  width: 100%;
  min-height: 2em;
}
input[type="submit"] {
  display: block;
  width: 60%;
  margin: 1em auto;
  height: 2em;
  font-size: 1.1rem;
  background-color: #3b3b9f;
  border-color: white;
  min-width: 300px;
}
.inline{
  display: inline;
  width: unset;
  margin: 0 0.5em 0 0;
  vertical-align: middle; 
}
#title{
  background-color: #1b1b32;
}