* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  font-family: "Montserrat", sans-serif;
}

body {
  padding-top: 100px;
  background-color: lightslategray;
}

.header {
  margin-bottom: 100px;
  text-align: center;
}

.boxes {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}

.boxes__box {
  width: 100px;
  height: 100px;
  border: 5px solid black;
  border-radius: 10px;
  background-color: cornflowerblue;
}

.box_a {
  background: url(img/a.png) center / cover no-repeat;
}
.box_b {
  background: url(img/b.png) center / cover no-repeat;
}
.box_c {
  background: url(img/c.png) center / cover no-repeat;
}
.box_d {
  background: url(img/d.png) center / cover no-repeat;
}
.box_e {
  background: url(img/e.png) center / cover no-repeat;
}
.box_f {
  background: url(img/f.png) center / cover no-repeat;
}