style.css

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap");

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

body {
  font-family: "Inter", sans-serif;
}

.popup {
  width: 450px;
  background: #fff;
}
.popup :where(.picker, header, .all-colors) {
  display: flex;
  align-items: center;
}
.popup .picker {
  padding: 30px 0;
  background: #ffeeee;
  justify-content: center;
}
.picker #color-picker {
  border: none;
  outline: none;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  padding: 10px 20px;
  border-radius: 5px;
  background: rgb(235, 70, 20);
  transition: 0.3s ease;
}
#color-picker:hover {
  background: #f05353;
}
.picked-colors {
  margin: 10px 15px;
}
.picked-colors header {
  justify-content: space-between;
}
.title {
  font-size: 1rem;
}
.clear-all {
  cursor: pointer;
  font-size: 0.9rem;
  color: #f05353;
}
.clear-all:hover {
  color: rgb(235, 70, 20);
}
.picked-colors.hide {
  display: none;
}
.picked-colors .all-colors {
  flex-wrap: wrap;
  list-style: none;
  margin: 20px 0;
}
.all-colors .color {
  display: flex;
  cursor: pointer;
  margin-bottom: 10px;
  width: calc(100% / 4);
}
.all-colors .rect {
  height: 21px;
  width: 21px;
  display: block;
  margin-right: 8px;
  border-radius: 5px;
  background-color: red;
}
.all-colors .color span {
  font-size: 0.96rem;
  font-weight: 500;
  text-transform: uppercase;
}