style.css

@import url('https://fonts.googleapis.com/css2?family=Raleway&display=swap');

html {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-y: hidden;
  display: flex;
  align-items: center;
  font-family: Raleway, sans-serif;
}

/* Video Background */
.video-background {
  position: fixed;
  right: 0;
  bottom: 0;
  width: 100vw;
}

video {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.video-overlay {
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  width: 100vw;
  background: rgba(0, 0, 0, 0.2);
}

/* Container */
.container {
  min-width: 580px;
  min-height: 304px;
  color: whitesmoke;
  margin: 0 auto;
  padding: 25px 50px;
  border-radius: 10px;
  z-index: 2;
  display: flex;
  justify-content: center;
  background: rgba(0, 0, 0, 0.65);
}

.input-container {
  position: relative;
  top: 20px;
}

h1 {
  font-size: 35px;
  text-align: center;
  margin-top: 0;
  margin-bottom: 10px;
}

/* Form */
.form {
  width: 480px;
}

label {
  font-weight: bold;
  margin-left: 10px;
}

input {
  width: 95%;
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 20px;
  background: #fff;
  outline: none;
  color: rgba(0, 0, 0, 0.8);
  font-family: Raleway, sans-serif;
  filter: invert();
}

/* Button */
button {
  width: 100%;
  height: 40px;
  border-radius: 20px;
  margin-top: 15px;
  border: none;
  text-transform: uppercase;
  background: #006959;
  color: white;
  cursor: pointer;
  outline: none;
  font-family: Raleway, sans-serif;
}

button:hover {
  filter: brightness(110%);
}



/* Countdown */
ul {
  margin-left: -45px;
}

li {
  display: inline-block;
  font-size: 30px;
  list-style-type: none;
  padding: 10px;
  text-transform: uppercase;
}

li span {
  display: block;
  font-size: 80px;
  text-align: center;
}

/* Complete */
.complete {
  position: relative;
  top: 60px;
}

.complete-title {
  animation: complete 4s infinite;
}

@keyframes complete {
  0% {
    color: rgb(255, 13, 13);
  }

  25% {
    color: rgb(255, 225, 13);
  }
  
  50% {
    color: rgb(13, 233, 13);
    transform: scale(1.15);
  }
  
  75% {
    color: rgb(0,191,255);
  }

  100% {
    color: rgb(98, 13, 255);
  }
}

/* Media Query: Large Smartphone (Vertical) */
@media screen and (max-width: 600px) {
  .video-background {
    height:100vh;
    width:100vw;
  }
  
  video {
    object-fit: cover;
    object-position: 70%;
    margin-top: -1px;
  }

  .container {
    min-width: unset;
    width: 95vw;
    min-height: 245px;
    padding: 20px;
    margin: 10px;
  }

  .input-container {
    top: unset;
  }

  .countdown {
    position: relative;
    top: 10px;
  }

  .form {
    width: unset;
  }

  input {
    width: 93%;
  }

  h1 {
    font-size: 20px;
  }

  li {
    font-size: 15px;
    padding: 3px;
  }

  li span {
    font-size: 25px;
  }
}