*,
::before,
::after {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

:root {
  font-family: 'Open Sans', sans-serif;
  --background-color: #e8f4fc;
  --color-one: #13c8a6;
  --color-one-dark: #10aa8c;
  --color-two: #efcb53;
  --color-two-dark: #be9b25;
  --color-three: #555fae;
  --color-three-dark: #404da2;
}

body {
  background-color: var(--background-color);
}

.container {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  flex-wrap: wrap;
}

.offer {
  position: relative;
  flex-shrink: 0;
  max-width: 14.5rem;
  margin: 2rem;
  padding: 2.5rem 2rem;
  border-radius: 1rem;
  background-color: white;
  text-align: center;
}

.offer:nth-child(1) {
  top: 4rem;
}

.offer:nth-child(2) {
  top: 6rem;
}

.offer:nth-child(3) {
  top: 8rem;
}

span.price {
  display: inline-block;
  margin-bottom: 7rem;
  font-size: 3rem;
}

span.plan {
  position: absolute;
  left: -0.5rem;
  top: 8rem;
  width: 10rem;
  padding: 1rem;
  border-radius: 0 1.3rem 1.3rem 0;
  font-size: 1.3rem;
  font-weight: bold;
  color: white;
}

.container .offer:nth-child(1) span.plan,
.container .offer:nth-child(1) a {
  background-color: var(--color-one);
}

.container .offer:nth-child(2) span.plan,
.container .offer:nth-child(2) a {
  background-color: var(--color-two);
}

.container .offer:nth-child(3) span.plan,
.container .offer:nth-child(3) a {
  background-color: var(--color-three);
}

span.plan::before {
  content: '';
  position: absolute;
  top: -0.35rem;
  left: 0.15rem;
  -webkit-transform: rotateZ(45deg);
  -ms-transform: rotate(45deg);
  transform: rotateZ(45deg);
  border: 0.35rem solid;
}

.container .offer:nth-child(1) span.plan::before {
  border-color: transparent transparent transparent var(--color-one-dark);
}

.container .offer:nth-child(2) span.plan::before {
  border-color: transparent transparent transparent var(--color-two-dark);
}

.container .offer:nth-child(3) span.plan::before {
  border-color: transparent transparent transparent var(--color-three-dark);
}

ul.features {
  margin: 0;
  padding: 0;
  list-style: none;
  line-height: 2.8;
}

a {
  display: inline-block;
  margin-top: 2rem;
  padding: 1rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  color: white;
}

@media screen and (min-width: 350px) {
  .offer {
    max-width: 20.5rem;
    height: 36rem;
    padding: 2.5rem 5rem;
  }
}

/* personal footer */

footer {
  margin-top: 8rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
  line-height: 1.5;
  text-align: center;
}

.platform,
.coder {
  font-weight: 600;
  padding: 0;
  margin: 0;
}

.platform {
  color: #2eca7f;
}

.coder {
  color: #cf2937;
}

a {
  text-decoration: none;
}