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

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

.home {
  width: 100%;
  height: 100vh;
  background: url(https://images8.alphacoders.com/114/thumb-1920-1143262.jpg)
    center/cover;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  padding-top: 250px;
}

.container {
  width: 450px;
  height: 275px;
  margin: auto;
  box-shadow: 0 0 10px rgba(182, 96, 79, 0.2);
  border-radius: 5px;
  position: relative;
  z-index: 1;
  background: inherit;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container button {
  padding: 10px 15px;
  border-radius: 5px;
  border: none;
  cursor: pointer;
  background: rgb(182, 96, 79);
  color: #f1f1f1;
  font-size: 27px;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 800;
}

/* Le before est un enfant du container, 
il va hériter du background avec background: inherit
et passer sous le contenu du parent avec z-index: -1*/
.container::before {
  content: "";
  position: absolute;
  background: inherit;
  z-index: -1;
  inset: 0;
  filter: blur(10px);
  max-width: -20px;
}