codepens/smoothie-app/dist/style.css

@import url("https://fonts.googleapis.com/css?family=Muli:300,400,600,900&display=swap");

* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  color: #333;
  font-family: "Muli", sans-serif;
  min-height: 100vh;
  /* add a circle with a linear gradient in the center of the screen, above another linear gradient */
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><linearGradient id="gradient" x1="0" y1="1" x2="1" y2="0"><stop offset="0" stop-color="%23FBDBE3"></stop><stop offset="1" stop-color="%23F39BAE"></stop></linearGradient><circle cx="50" cy="50" r="50" fill="url(%23gradient)"></circle></svg>'),
    linear-gradient(45deg, #ffecf0, #f5c3cf);
  background-position: 50%, 0%;
  background-size: 40%, 100%;
  background-repeat: no-repeat;
}

/* for the phone UI specify a tall, thin, rounded rectangle */
div.phone {
  max-width: 280px;
  margin: 2rem auto;
  border-radius: 15px;
  background: #fffffd;
  /* display the content in a column */
  display: flex;
  flex-direction: column;
  /* add multiple shadows to make a solid rounded border with a small blue-ish overlay and a softer shadow */
  box-shadow: 0 0 0 0.02rem #ddf, 0 0 1rem 0.1rem #f4f4ff, 0 0 0 0.8rem #fcfcff,
    0 0 0.8rem 0.5rem #ccf;
}

/* display the navigation's items in a row */
.phone__nav {
  display: flex;
  align-items: center;
  padding: 0.5rem 1rem;
  margin-bottom: 0.5rem;
}
.phone__nav span {
  flex-grow: 1;
  font-weight: 600;
  font-size: 0.7rem;
}
.phone__nav svg {
  margin: 0 0.1rem;
  width: 0.8rem;
  height: 0.8rem;
}

.phone__state {
  padding: 0 1rem;
}
.phone__state h2 {
  color: #ff4966;
  font-size: 1.4rem;
}
.phone__state p {
  font-size: 0.8rem;
}

/* display the drink in the center of the phone */
.phone__drink {
  align-self: center;
  width: 70%;
  height: auto;
  margin: 1.5rem 0 0;
}

/* display the ingredients in a non-wrapping row */
.phone__ingredients {
  display: flex;
  align-items: center;
  margin: 0 0.5rem;
  /* allow for horizontal scroll */
  overflow-x: auto;
}
/* visually hide the scrollbar */
.phone__ingredients::-webkit-scrollbar {
  opacity: 0;
}
/* prevent the buttons from shrinking */
.phone__ingredients button {
  margin: 0.5rem;
  flex-shrink: 0;
  border: none;
  background: none;
  position: relative;
  font-family: inherit;
  /* display the svg and span atop one another */
  display: flex;
  flex-direction: column;
  align-items: center;
}
.phone__ingredients button svg {
  width: 78px;
  height: 78px;
  display: block;
  filter: drop-shadow(0 0 10px hsla(0, 0%, 0%, 0.05));
}
/* have the span overlap on the svg */
.phone__ingredients button span {
  position: relative;
  border-radius: 20px;
  background: #ff4966;
  color: #fff;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  margin-top: -0.5rem;
}
/* on click darken the background color of the span element through an overlapping pseudo element */
.phone__ingredients button span:before {
  position: absolute;
  content: "";
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  background: #000;
  opacity: 0;
  transform: translate(-50%, -50%) scale(0);
  transition-property: opacity, transform;
  transition-duration: 0.1s;
  transition-timing-function: ease-out;
}
.phone__ingredients button:active span:before {
  opacity: 0.2;
  transform: translate(-50%, -50%) scale(1);
}

/* display the receipt on a completely white background */
.phone__order {
  display: flex;
  background: #fff;
  margin: 0.5rem 0.75rem 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: 15px;
  box-shadow: 0 1px 15px -2px #f5c3cf;
  min-height: 75px;
}
/* have the heading and list stretch to occupy the available width */
.phone__order .order--list {
  flex-grow: 1;
}
.phone__order .order--list h3 {
  font-size: 0.6rem;
  color: #ff4966;
  text-transform: uppercase;
  margin-bottom: 0.1rem;
}
/* remove the bullet point from the unordered list */
.phone__order .order--list ul {
  list-style: none;
  font-size: 0.8rem;
  text-transform: capitalize;
  line-height: 1.5;
}

/* highlight the button with the accent color
replicate the active state created for the ingredients' span
! enable this state alongside full opacity only when a class is added
this to highlight when the button is clickable
*/
.phone__order button {
  align-self: center;
  background: #ff4966;
  border: none;
  color: #fff;
  width: 30px;
  height: 30px;
  padding: 0.3rem;
  border-radius: 50%;
  opacity: 0.5;
  cursor: not-allowed;
  transition: opacity 0.15s ease-out;
}
.phone__order button svg {
  display: block;
  width: 100%;
  height: 100%;
}
.phone__order.complete button {
  opacity: 1;
  cursor: pointer;
}