Untitled

.container {
  width: fit-content;
  margin: 50px auto 0px auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: antiquewhite;
  border-radius: 10px;
}
p {
  color: red;
  margin-top: 0;
}
.NameDiv {
  border-bottom: 2px solid black;
  margin-bottom: 10px;
}
input {
  width: 400px;
  margin: 0 0 20px 0;
  border: none;
  height: 50px;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.444);
}
button {
  width: 400px;
  height: 50px;
  border-radius: 10px;
  border: none;
  background-color: blue;
  cursor: pointer;
}