style.css

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap");

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

body {
  font-family: "Poppins", sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  perspective: 1000px;
}

.container {
  width: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.card {
  min-height: 80vh;
  width: 25rem;
  box-shadow: 0px 20px 20px rgba(0, 0, 0, 0.2), 0px 0px 50px rgba(0, 0, 0, 0.2);
  border-radius: 30px;
  padding: 0rem 2rem;
  transform-style: preserve-3d;
}

.sneaker {
  min-height: 35vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.sneaker img {
  width: 13rem;
  z-index: 2;
  transition: all 0.75s ease-out;
}

.circle {
  width: 7rem;
  height: 7rem;
  background: linear-gradient(
    to right,
    rgba(245, 70, 66, 0.75),
    rgba(8, 83, 156, 0.75)
  );
  position: absolute;
  z-index: -1;
  border-radius: 50%;
}

.info h1 {
  font-size: 1.7rem;
  transition: all 0.75s ease-out;
}

.info h3 {
  font-size: 1rem;
  padding: 2rem 0rem;
  color: #585858;
  font-weight: lighter;
  transition: all 0.75s ease-out;
}

.sizes {
  display: flex;
  justify-content: space-between;
  transition: all 0.75s ease-out;
}

.sizes button {
  padding: 0.5rem 2rem;
  background: none;
  border: none;
  box-shadow: 0px 5px 10px rgba(0, 0, 0, 0.2);
  border-radius: 30px;
  cursor: pointer;
  font-weight: bold;
  font-family: inherit;
  color: #585858;
}

button.active {
  color: white;
  background-color: #585858;
}

.purchase {
  margin-top: 3rem;
  transition: all 0.75s ease-out;
}

.purchase button {
  width: 100%;
  padding: 1rem 0rem;
  background: #f54642;
  border: none;
  color: white;
  cursor: pointer;
  border-radius: 30px;
  font-weight: bolder;
  font-family: inherit;
}

@media screen and (min-width: 740px) {
  .card {
    width: 35rem;
    padding: 0rem 5rem;
  }

  .sneaker img {
    width: 20rem;
  }

  .circle {
    width: 15rem;
    height: 15rem;
  }

  .info h1 {
    font-size: 3rem;
  }

  .info h3 {
    font-size: 1.3rem;
  }
}