*,
*::before,
*::after {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: url(../images/dancing-as-hobby-african-american-female-hip-hop.jpg);
  background-size: cover;
  text-align: center;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  padding: 15px;
  min-height: 100vh;
  font-family: sans-serif;
  line-height: 1.5;
  background-position: center;
}
.container-wrapper {
  max-width: 1000px;
  margin: 0 auto;
}
.heading {
  font-weight: 300;
  font-size: calc(2vw + 1.5rem);
  letter-spacing: 2px;
}
.sub-heading {
  font-weight: 700;
  font-size: calc(2vw + 1rem);
}
.contribution h4 {
  font-weight: 100;
  font-size: calc(1vw + 1rem);
  margin-bottom: 20px;
}
.contribution .button-wrapper {
  display: flex;
  justify-content: space-evenly;
  flex-wrap: wrap;
}
.contribution .button-wrapper a {
  display: inline-block;
  border: 2px solid #ffffff67;
  padding: 10px 7%;
  text-decoration: none;
  color: #fff;
  border-radius: 30px;
  font-size: calc(1vw + 1rem);
  line-height: 1;
  box-shadow: 3px 3px 10px 0px rgba(255, 255, 255, 0.75) inset;
  -webkit-box-shadow: 3px 3px 10px 0px rgba(255, 255, 255, 0.75) inset;
  -moz-box-shadow: 3px 3px 10px 0px rgba(255, 255, 255, 0.75) inset;
}