Apple.css

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

:root {
  --applefont: -apple-system, BlinkMacSystemFont, sans-serif;
  --whitegrad: linear-gradient(
    180deg,
    rgb(255, 255, 255) 0%,
    rgb(255, 255, 255) 64%
  );
}

input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

body {
  background: #f4f4f4;
}

input,
.inline {
  margin-bottom: 10px;
}

h1 {
  font-family: var(--applefont);
  margin: auto;
  text-align: center;
  padding-top: 40px;
  padding-bottom: 30px;
  font-size: 50px;
}

h4,
.applelogo {
  font-family: var(--applefont);
  font-size: 100px;
  color: #000000;
  padding: 0px;
  margin-left: 45px;
  padding-top: 13px;
}

h2 {
  font-family: var(--applefont);
  text-align: center;
  padding-top: 25px;
}

h3 {
  font-family: var(--applefont);
  margin: auto;
  margin-top: 1px;
  margin-left: 55px;
  text-align: left;
  padding-left: 0px;
  padding-right: 10px;
}

p {
  font-family: var(--applefont);
  font-weight: 500;
  margin: auto;
  text-align: left;
  margin-left: 50px;
  padding-top: 10px;
  padding-bottom: 60px;
  padding-right: 170px;
}

#description {
  margin-left: 55px;
}

fieldset {
  display: flex;
  flex-direction: column;
  margin: 5%;
  margin-top: 2%;
  border: none;
}

label {
  display: block;
  margin-right: 5px;
  margin-left: 10px;
  margin-bottom: 2px;
  text-align: left;
  font-family: var(--applefont);
  font-weight: bold;
}

br {
  margin: 2px;
}

div[name="spacer"] {
  padding: 2px;
}

div {
  background: var(--whitegrad);
  background: linear-gradient(145deg, #ffffff, #dcdcdc);
  box-shadow: 23px 23px 51px #adadad, -23px -23px 51px #ffffff;
  border-radius: 50px;
  border-width: 1px 1px;
  width: 60%;
  margin: auto;
}

input {
  border: solid 1px #000000;
}

input[type="checkbox"] {
  border: solid 1px #000000;
}

#apple_id {
  display: flex;
  flex-direction: row;
}

/* custom checkbox */
.checkbox-container {
  display: inline-block;
  position: relative;
  padding-left: 35px;
  margin-bottom: 12px;
  cursor: pointer;
  font-size: 16px;
  user-select: none;
}

.custom-checkbox {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

.checkmark {
  position: absolute;
  top: 0;
  left: 0;
  height: 25px;
  width: 25px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  border-radius: 7px;
  transition: background-color 0.3s;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.checkmark:after {
  content: "";
  position: absolute;
  display: none;
  left: 10px;
  top: 6px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 3px 3px 0;
  transform: rotate(45deg);
}

.custom-checkbox:checked ~ .checkmark {
  background: linear-gradient(145deg, #36b9ff, #008be6);
  box-shadow: 0 3px 7px rgba(33, 150, 243, 0.3);
}

.custom-checkbox:checked ~ .checkmark:after {
  display: block;
}
/* custom checkbox */

@keyframes checkAnim {
  0% {
    height: 0;
  }

  100% {
    height: 10px;
  }
}

.custom-checkbox:checked ~ .checkmark:after {
  animation: checkAnim 0.2s forwards;
}

/* custom radio button */
.radio-inputs {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  border-radius: 10px;
  background-color: #d4d4d4;
  box-sizing: border-box;
  background: #eeeeee;
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  margin-left: 6%;
  margin-right: 10px;
  padding: 0.25rem;
  width: 300px;
  font-size: 14px;
}

.radio-inputs .radio {
  flex: 1 1 auto;
  text-align: center;
}

.radio-inputs .radio input {
  display: none;
}

.radio-inputs .radio .name {
  display: flex;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  border: none;
  padding: 0.5rem 0;
  color: rgba(51, 65, 85, 1);
  transition: all 0.15s ease-in-out;
}

.radio-inputs .radio input:checked + .name {
  background: linear-gradient(145deg, #36b9ff, #008be6);
  color: #ffffff;
  box-shadow: 2px 2px 4px #9b9b9b, -2px -2px 4px #ffffff;
  font-weight: 600;
  transition: 0.5s;
}
/* custom radio button */

input[type="submit"] {
  background: linear-gradient(145deg, #36b9ff, #008be6);
  box-shadow: 9px 9px 18px #9f9f9f, -9px -9px 18px #ffffff;
  border-radius: 25px;
  border-style: hidden;
  font-size: 1em;
  color: white;
  width: 200px;
  height: 50px;
  font-family: var(--applefont);
  padding: 20px;
  padding-top: 10px;
  padding-bottom: 10px;
  margin: auto;
  margin-left: 45px;
  margin-top: 35px;
  margin-bottom: 35px;
  cursor: pointer;
}

.number {
  inline-size: none;
  display: block;
  border-radius: 10px;
  border-style: hidden;
  width: 170px;
  height: 30px;
  margin-top: 7px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
}

.inline {
  height: 17px;
  width: 30px;
  background-color: #e9e9e9;
}

input[type="text"] {
  display: block;
  border-radius: 10px;
  border-style: hidden;
  width: 170px;
  height: 30px;
  margin-right: 30px;
  margin-top: 7px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
}

input[type="password"] {
  display: block;
  border-radius: 10px;
  border-style: hidden;
  width: 170px;
  height: 30px;
  margin-top: 7px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
}

input[type="email"] {
  display: block;
  border-radius: 10px;
  border-style: hidden;
  width: 170px;
  height: 30px;
  margin-top: 7px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
}

form {
  padding-top: 20px;
  padding-bottom: 70px;
}

textarea {
  border-radius: 10px;
  border-style: hidden;
  height: 100px;
  min-width: 300px;
  min-height: 100px;
  max-width: 280px;
  max-height: 200px;
  align-items: left;
  padding-left: 6px;
  padding-top: 7px;
  margin-left: 10px;
  margin-top: 10px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
}

select {
  appearance: none;
  border-radius: 10px;
  border-style: hidden;
  height: 30px;
  max-width: 170px;
  padding-left: 10px;
  margin-left: 10px;
  background: linear-gradient(145deg, #dcdcdc, #ffffff);
  box-shadow: 4px 4px 8px #cdcdcd, -4px -4px 8px #ffffff;
  color: #000000;
  cursor: pointer;
}

@media only screen and (max-width: 750px) {
  h4,
  .applelogo {
    font-size: 50px;
    padding-top: 20px;
    padding-bottom: 20px;
    margin-left: 25px;
  }

  h3 {
    margin-left: 27px;
  }

  #description {
    margin-left: 30px;
  }

  p {
    padding-right: 20px;
  }

  div {
    width: 100%;
  }

  input[type="submit"] {
    margin-left: 30px;
  }
}