style.css

@import url("https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap");

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

body {
  font-family: Space Mono;
}

/*  */

section {
  background: #c5e4e7;
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
main {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 920px;
  height: 481px;
  border-radius: 25px;
  background: #fff;
  box-shadow: 0px 32px 43px 0px rgba(79, 166, 175, 0.2);
}

main .left__half {
  width: 50%;
}

main .left__half span {
  color: #5e7a7d;
  font-size: 16px;
  font-weight: 700;
}

main .left__half .bill__section {
  width: 379px;
  height: 48px;

  color: #5e7a7d;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: none;
  outline: none;
  border-radius: 5px;
  background: #f3f9fa;
  padding: 0 10px;
  margin-bottom: 10px;
  transition: 0.3s ease-in-out;
  cursor: pointer;
}
main .left__half .bill__section:hover {
  border: 2px solid #26c2ae;
}
main .left__half .bill__section input {
  text-align: right;
  border: none;
  background: transparent;
  width: 80%;
  cursor: pointer;

  color: #00474b;
  text-align: right;
  font-size: 24px;
  font-style: normal;
  font-weight: 700;
  line-height: normal;
}
main .left__half .bill__section input:focus,
main .left__half .people__section input:focus {
  outline: none;
}

main .left__half input {
  width: 379px;
  height: 48px;
  flex-shrink: 0;
}

/* errors */
.num_error {
  position: relative;
  margin-bottom: 20px;
}
.error-1 {
  position: absolute;
  right: 90px;
  color: #e17457 !important;
  font-size: 16px;
  font-weight: 700;
  display: none;
}
.num_error .error-1.active {
  display: block;
}

/* tip section */
.tip__section {
  display: grid;
  grid-template-columns: auto auto auto;
  width: 379px;
  margin-top: 30px;
  margin-bottom: 30px;
}
.tip {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #00474b;
  border: 1px solid rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 20px;
  text-align: center;
  width: 117px;
  height: 48px;
  margin: 5px;
  font-weight: 700;
  text-align: center;
  font-size: 24px;
  cursor: pointer;
  border-radius: 5px;

  transition: 0.2s ease-in-out;
}
.tip:hover {
  background: #9fe8df;
  color: #00474b;
  border: 1px solid transparent;
}
.tip__section input {
  width: 117px !important;
  height: 48px !important;
  margin: 5px;
  border-radius: 5px;

  color: #547878;
  text-align: right;
  font-size: 24px;
  font-weight: 700;
  border: none;
  outline: none;
  background: #c5e4e7;
}
main .left__half .people__section {
  width: 379px;
  height: 48px;

  color: #5e7a7d;
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: none;
  outline: none;
  border-radius: 5px;
  background: #f3f9fa;
  padding: 0 10px;
  margin-bottom: 10px;
}
main .left__half .people__section input {
  text-align: right;
  border: none;
  background: transparent;
  width: 80%;

  color: #00474b;
  text-align: right;
  font-size: 24px;
  font-style: normal;
  font-weight: 700;
  line-height: normal;
}

/* right half */

.right__half {
  width: 413px;
  height: 417px;
  flex-shrink: 0;
  border-radius: 15px;
  background: #00474b;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 50px;
  overflow: hidden;
}

.right__half span {
  color: #26c2ae;
  font-size: 48px;
  font-weight: 700;
}
.right__half .amount {
  width: 333px;
  height: 71px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.right__half .amount div h4,
.right__half .total div h4 {
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  line-height: normal;
}
.right__half .amount div p,
.right__half .total div p {
  color: #7f9d9f;
  font-size: 13px;
  font-weight: 700;
}

.right__half .total {
  /* background: #000; */
  width: 333px;
  height: 71px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.right__half button {
  width: 333px;
  height: 48px;
  border-radius: 5px;
  background: #26c2ae;
  border: none;
  cursor: pointer;

  color: #00474b;
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  transition: 0.3s ease-in-out;
}
.right__half button:hover {
  background: #9fe8df;
}
/* media */
@media (max-width: 925px) {
  section {
    height: fit-content;
    border-radius: 0;
  }

  main {
    margin-top: 100px;
    background: #fff;
    height: fit-content;
    flex-direction: column;
    justify-content: center;
    width: fit-content;
    margin-bottom: 30px;
    padding: 30px;
  }

  main .left__half {
    width: 95% !important;
  }

  .tip__section input {
    text-align: center;
  }

  .amount,
  .total {
    text-align: center;
  }
}
@media (max-width: 600px) {
  main {
    margin-top: 100px;
    height: fit-content;
    flex-direction: column;
    justify-content: center;
    width: fit-content;
    margin-bottom: 30px;
    padding: 30px;
    width: 350px;
  }

  main .left__half {
    width: 100% !important;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .bill__section {
    width: 100% !important;
  }

  .tip__section {
    display: grid;
    grid-template-columns: auto auto;
    width: 100%;
  }

  .people__section {
    width: 100% !important;
  }
  main .right__half {
    width: 110% !important;
    display: flex;
    justify-content: center;
  }

  .right__half span {
    text-align: right;
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.667px;
  }
  .right__half .amount,
  .right__half .total {
    justify-content: space-around !important;
  }
  .right__half .amount div h4,
  .right__half .total div h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 700;
  }

  .right__half button {
    width: 80%;
  }
}
@media (max-width: 355px) {
  main {
    height: fit-content;
    justify-content: center;
    width: fit-content;
    margin-bottom: 30px;
    width: 280px;
  }

  .tip__section .tip {
    width: 100px;
  }
  .tip__section input {
    font-size: 18px;
    width: 100px !important;
  }

  .right__half{
    align-items: center;
    height: fit-content;
    padding: 10px 0;
  }
  .right__half .amount,
  .right__half .total{
    justify-content: center !important;
    gap: 30px;
  }
}