styles.css

body,
html {
  margin: 0;
  padding: 0;
  background-color: #f8f7f3;
  font-family: "Overpass", sans-serif;
}

#container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  max-width: 1280px;
  margin: 80px auto 0;
  padding: 0 20px;
  gap: 20px;
  box-sizing: border-box;
}

header {
  background-color: #1a24fb;
  color: #fff;
  padding: 10px 20px;
  font-size: 12px;
  letter-spacing: 0.2em;
  font-weight: normal;
  text-align: left;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  text-transform: uppercase;
}

.card {
  background-color: #fff;
  border: 1px solid #1a24fb;
  margin-bottom: 100px;
  padding: 40px;
  position: relative;
  box-sizing: border-box;
  flex: 0 1 calc(33.333% - 20px);
}

.card-number {
  color: #1a24fb;
  font-size: 24px;
  font-family: "Montserrat", sans-serif;
  position: absolute;
  top: 10px;
  right: 10px;
  font-weight: 600;
}

.card-sub {
  font-size: 16px;
  letter-spacing: 0.2em;
  font-weight: 500;
  color: #1a24fb;
  margin-bottom: 30px;
  text-transform: uppercase;
}

.card-title {
  font-family: "Montserrat", sans-serif;
  font-size: 36px;
  font-weight: bold;
  color: #1a24fb;
}

.card-text {
  font-size: 16px;
  font-weight: 500;
  color: #1a24fb;
  margin-bottom: 20px;
}

.card button {
  background-color: #f8f7f3;
  color: #1a24fb;
  padding: 0px 10px;
  font-size: 14px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  position: absolute;
  bottom: -28px;
  left: -10px;
  text-align: center;
  text-transform: lowercase;
}

.card:hover button {
  background-color: #1a24fb;
  color: #f8f7f3;
  padding: 0px 10px;
  font-size: 14px;
  border: none;
  cursor: pointer;
  text-transform: uppercase;
  position: absolute;
  bottom: -28px;
  left: -10px;
  text-align: center;
  text-transform: lowercase;
}

@media (max-width: 768px) {
  .card {
    flex: 0 1 calc(100% - 20px);
  }

  header {
    position: static;
  }
}