style.css

* {
  margin: 0;
  padding: 0;
  color: rgb(34, 34, 34);
  box-sizing: border-box;
}

body {
  scroll-behavior: smooth;
  text-rendering: optimizeSpeed;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  width: 100%;
}

/* СУПЕР-КОД ЩОБ ПРИБРАТИ СТРЕЛОЧКИ З ІНПУТІВ */

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
}

input[type='number'],
input[type="number"]:hover,
input[type="number"]:focus {
  appearance: none;
  -moz-appearance: textfield;
}

input {
  display: inline;
}

.main-wrapper {
  margin: 100px auto;
}

.form-wrapper {
  margin: 0 auto;
  padding: 15px 20px 20px;
  height: 450px;
  width: 550px;
  border: 4px solid rgb(21, 150, 96);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  background-color: rgb(211, 248, 236);
}

.input-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 80%;
}

.input-title {
  font-size: 18px;
  font-weight: 700;
}

.input-field {
  height: 37px;
  border: 3px solid rgb(21, 150, 96);
  width: 250px;
  align-self: end;
  font-size: 18px;
  font-weight: 600;
  border-radius: 7px;
  padding: 0 5px;
}

.input-field:focus {
  border: 3px solid rgb(0, 82, 48);
  outline:none;
}

.registr-button {
  width: 200px;
  height: 40px;
  font-size: 18px;
  font-weight: 600;
  border-radius: 7px;
  cursor: pointer;
  border: 3px solid rgb(21, 150, 96);
  background-color: rgb(243, 253, 244);
}

.registr-button:hover {
  border: 3px solid rgb(0, 82, 48);
  background-color: rgb(0, 82, 48);
  color: aliceblue;
  transition-duration: 0.07s;
  transform: scale(1.07);
}