HTMLify

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

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.container {
  width: 40%;
  height: 40%;
  background: #1c1c1c;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.container input {
  padding: 10px 20px;
  margin-bottom: 20px;
  width: 80%;
  outline: none;
}

.container button {
  padding: 10px 20px;
  border: none;
  background: transparent;
  background: crimson;
  width: 150px;
  color: #fff;
  cursor: pointer;
}

.background-image {
  background-image: url("https://images8.alphacoders.com/601/thumb-1920-601705.jpg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  position: absolute;
  top: -20px;
  bottom: -20px;
  left: -20px;
  right: -20px;
  z-index: -1;
  filter: blur(20px);
}