style.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100;300;400&display=swap');

@keyframes show-content {
  from {
    opacity: 0;
    transform: scale(.95);
  } to {
    opacity: 1;
    transform: unset;
  }
}

html, body {
  margin: 0;
  padding: 0;
  background-color: black;
  color: white;
}
body {
  display: flex;
  flex-direction: row;
  font-family: "Inter";
}
* {
  transition: 250ms;
}
body * {
  animation: show-content 800ms ease-out forwards;
}
@media (prefers-reduced-motion) {
  *, body * {
    transition: 0s;
    animation-duration: 0s;
  }
}

img, iframe {
  display: block;
  border: none;
  object-fit: cover;
  max-width: 100vw;
}
img:hover {
  object-fit: contain;
}
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  gap: 4px;
}
article, address {
  max-width: 80ch;
  font-weight: 300;
  text-align: justify;
}

input {
  padding: 7px 14px;
  background: radial-gradient(100% 100% at 100% 100%, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.25) 100%), linear-gradient(180deg, #444444 0%, #222222 100%);
  box-shadow: 0px 0px 4px rgba(0, 0, 0, 0.25);
  border-radius: 2px;
  color: whitesmoke;
  border: none !important;
  outline: none !important;
  cursor: pointer;
}
input:hover {
  background: linear-gradient(0deg, rgba(204, 204, 204, 0.15), rgba(204, 204, 204, 0.15)), radial-gradient(100% 100% at 100% 100%, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.25) 100%), linear-gradient(180deg, #444444 0%, #222222 100%);
}
input:active, input:focus {
  background: radial-gradient(100% 100% at 100% 100%, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.5) 100%), linear-gradient(180deg, #444444 0%, #222222 100%);
}
input:invalid {
  outline: solid darkred 2px !important;
}
input:valid {
  animation: becomes-valid 250ms ease-out;
}
@keyframes becomes-valid {
  0% {
    outline: solid darkred 2px !important;
  } 50% {
    outline: solid green 2px !important;
  } 100% {
    outline: unset;
  }
}

a {
  color: lightblue;
  text-decoration: none;
}
a:hover {
  text-shadow: 0px 0px 6px currentColor;
}
h1 {
  font-weight: 300;
  text-transform: uppercase;
  letter-spacing: 2px;
}

@media only screen and (max-width: 780px) {
  body {
    flex-direction: column;
  }
}
@media only screen and (min-width: 781px) {
  img, iframe {
    max-width: 65%;
    height: 100vh;
  }
  main {
    width: 100%;
  }
}