* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #002339;
  color: #fff;
  overflow: hidden;
}
.container {
  display: flex;
  max-width: 100%;
  height: 100vh;
  padding: 2px 10px 10px 10px;
  margin: 10px;
  flex-direction: column;
}
.main-icon {
  display: flex;
  width: 100%;
  justify-content: center;
}
.main-icon img {
  height: 140px;
  width: 250px;
  margin: 10px auto;
  box-shadow: 0 0 500px #00f5ff, 0 0 20px #00ff85, 0 0 30px #00f5ff;
  border-radius: 12px;
}
h1 {
  margin: 40px 50px 30px 90px;
  font-size: 45px;
  font-weight: 500;
}
h1 span {
  color: #019f55;
  border-bottom: 2px solid #019f55;
}
.display {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 50%;
  margin: 5px 10px 30px 90px;
  padding: 20px 30px;
  background-color: white;
  border-radius: 8px;
  height: 70px;
}
.display input {
  max-width: 80%;
  border: 0;
  outline: 0;
  font-size: 28px;
}
.display img {
  width: 35px;
  cursor: pointer;
  margin-right: 20px;
}
.container button {
  width: 300px;
  background: #019f55;
  border-radius: 8px;
  border: 0;
  outline: 0;
  padding: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-left: 90px;
  margin-top: 10px;
  font-size: 24px;
  color: white;
}

/* TOAST ANIMATION */
#toast {
  display: none;
  color: black;
  font-size: 22px;
}
.clicked {
  transform: scale(0.85);
}

.container button img {
  width: 30px;
  margin-right: 20px;
}
.footer {
  width: 400px;
  height: 40px;
  color: #002339; /* dark text over neon gradient */
  text-align: center;
  padding: 6px;
  color: white;
  font-size: 16px;
  margin: 30px auto;
  border-radius: 6px;
  font-style: italic;
}

@media (min-width: 1284px) {
  h1 {
    margin: 40px 50px 20px 90px;
    font-size: 60px;
    font-weight: 400;
  }
  .display {
    width: 600px;
    height: 60px;
    margin: 40px 0px 5px 90px;
  }
  button img {
    width: 30px;
    height: 35px;
  }
  .container button {
    font-size: 25px;
    width: 250px;
    height: 50px;
    margin: 40px 0 0 90px;
  }
  .display input {
    font-size: 25px;
  }
  .display img {
    width: 30px;
  }
  .container button {
    font-size: 18px;
    width: 260px;
  }
  .footer {
    margin: 140px auto;
    font-size: 16px;
  }
}
@media (min-width: 768px) and (max-width: 986px) {
  .main-icon {
    transform: scale(0.9);
  }
  h1 {
    margin: 20px 50px 20px 90px;
    font-size: 38px;
    font-weight: 400;
  }
  .display {
    width: 500px;
    height: 60px;
    margin: 5px 0px 5px 90px;
  }
  .display input {
    font-size: 20px;
  }
  .display img {
    width: 30px;
  }
  .container button {
    font-size: 18px;
    width: 250px;
  }
  .footer {
    margin: 30px auto;
    font-size: 14px;
  }
}

@media (min-width: 576px) and (max-width: 768px) {
  .main-icon {
    transform: scale(0.8);
  }
  h1 {
    margin: 30px 50px 20px 40px;
    font-size: 30px;
    font-weight: 500;
  }
  .display {
    width: 450px;
    height: 60px;
    margin: 20px 0px 5px 40px;
  }
  .display input {
    font-size: 18px;
  }
  .display img {
    width: 28px;
  }
  .container button {
    font-size: 18px;
    width: 230px;
    margin: 15px 0 0 40px;
    height: 50px;
  }
  .container button img {
    width: 22px;
    margin-right: 20px;
  }
  .footer {
    margin: 30px auto;
    font-size: 14px;
  }
}

@media (min-width: 480px) and (max-width: 576px) {
  .main-icon {
    transform: scale(0.8);
  }
  h1 {
    margin: 30px 50px 20px 40px;
    font-size: 30px;
    font-weight: 500;
  }
  .display {
    width: 390px;
    height: 50px;
    margin: 30px 0px 5px 40px;
  }
  #toast {
    display: none;
    color: black;
    font-size: 18px;
    margin-right: 10px;
  }
  .display input {
    font-size: 18px;
  }
  .display img {
    width: 25px;
    margin-right: 10px;
  }
  .container button {
    font-size: 16px;
    width: 220px;
    margin: 30px 0 0 40px;
    height: 45px;
  }
  .container button img {
    width: 20px;
    margin-right: 20px;
  }
  .footer {
    margin: 20 auto;
    font-size: 14px;
  }
}

@media (min-width: 420px) and (max-width: 480px) {
  .main-icon {
    transform: scale(0.7);
  }
  h1 {
    margin: 20px 50px 20px 10px;
    font-size: 31px;
    font-weight: 500;
  }
  .display {
    width: 340px;
    height: 50px;
    margin: 30px 0px 5px 10px;
  }
  .display input {
    font-size: 16px;
    width: 220px;
  }
  #toast {
    display: none;
    color: black;
    font-size: 16px;
    margin-right: 10px;
  }
  .display img {
    width: 25px;
    margin-right: 0px;
  }
  .container button {
    font-size: 16px;
    width: 220px;
    margin: 20px 0 0 10px;
    height: 45px;
  }
  .container button img {
    width: 20px;
    margin-right: 20px;
  }
  .footer {
    margin: 30px auto;
    font-size: 14px;
  }
}

@media (max-width: 420px) {
  .main-icon {
    transform: scale(0.7);
    margin: 5px auto;
  }
  h1 {
    margin: 60px 50px 20px 10px;
    font-size: 31px;
    font-weight: 500;
  }
  .display {
    width: 280px;
    height: 50px;
    margin: 50px 0px 5px 10px;
  }
  .display input {
    font-size: 18px;
    width: 140px;
  }
  #toast {
    display: none;
    color: black;
    font-size: 16px;
    margin-right: 10px;
  }
  .display img {
    width: 25px;
    margin-right: 5px;
  }
  .container button {
    font-size: 16px;
    width: 220px;
    margin: 40px 0 0 10px;
    height: 45px;
  }
  .container button img {
    width: 20px;
    margin-right: 20px;
  }
  .footer {
    margin: auto;
    font-size: 14px;
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translate(-50%);
  }
}