style.css

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  color: white;
}
html,
body {
  height: 100%;
  width: 100%;
}
.main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  height: 100vh;
  width: 100vw;
  background-size: cover;
}
.colOut {
  background-color: black;
  height: 370px;
  width: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  border-radius: 20px;
  opacity: 85%;
}
.colIn {
  height: 350px;
  width: 50px;
  background-color: black;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  flex-direction: column;
  gap: 50px 0px;
}
.sqr {
  height: 50px;
  width: 50px;
  background-color: white;
  box-shadow: 0px 0px 20px white;
  border-radius: 30%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.sqr:hover {
  width: 53px;
  border-radius: 40%;
  transition: 0.2s;
}
.info {
  position: absolute;
  bottom: 0;
  right: 0;
}
.invisible {
  visibility: hidden;
}
.fa-circle-info {
  font-size: 30px;
  padding: 5px;
  margin: 10px;
  cursor: pointer;
  border-radius: 50%;
}
.alert {
  position: absolute;
  visibility: hidden;
  top: 0;
  right: 30%;
  left: 30%;
  padding: 20px;
  background-color: #f44336;
  color: white;
  user-select: none;
}

.closebtn {
  margin-left: 15px;
  color: white;
  font-weight: bold;
  float: right;
  font-size: 22px;
  line-height: 20px;
  cursor: pointer;
  user-select: none;
}

/* In case someone would have got less than 490 px */
@media only screen and (max-width: 490px) {
  .colOut {
    height: 40%;
    width: 30%;
    gap: 10%;
  }
  .colIn {
    height: 80%;
    width: 45%;
    gap: 10% 10%;
    padding: 0 5%;
  }
  .sqr {
    height: 20%;
    width: 100%;
    gap: 50px 0px;
  }
  .sqr:hover {
    height: 20%;
    width: 100%;
    gap: 50px 0px;
  }
}