* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  margin: 0 auto;
  max-width: 1100px;
  background-image: linear-gradient(red, black);
  padding: 20px;
  color: #222;
}
header {
  text-align: center;
  margin-bottom: 40px;
  padding: 20px;
}
main {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: center;
}
main > section:not(:last-child) {
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 2px 10px rgb(0 0 0 / 0.1);
  flex: 1 1 320px;
  max-width: 400px;
}
main > section:last-child {
  flex: 1 1 100%;
  background: white;
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 3px 15px rgba(0,0,0,0.15);
}
.tasks-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
}
.boxes-wrapper {
  display: flex;
  gap: 30px;
  justify-content: center;
  flex-wrap: wrap;
}
.box {
  width: 280px;
  height: 280px;
  border-radius: 8px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.1);
  position: relative;
}
.task-label {
  position: absolute;
  top: 10px;
  width: 100%;
  text-align: center;
  font-weight: bold;
  font-size: 18px;
  color: #fff;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}
.a {
  background-image: linear-gradient(to top right, yellow, red 50%, black);
}

.b {
  background-image: radial-gradient(circle at right, white, darkblue);
}

.c {
  background-image: linear-gradient(
    to bottom,
    red 0%,
    red 33.33%,
    white 33.33%,
    white 66.66%,
    blue 66.66%,
    blue 100%
  );
}
footer {
  text-align: center;
  margin-top: 40px;
}