style.css

body {
  background-image: url('background.gif');
  background-size: cover;
}

#h1-title {
  color: azure;
  text-align: center;
  margin: 10px auto auto;
}

#title {
  text-align: center;
  margin: 10px auto auto;
  color: black;
}

#color-palette {
  display: flex;
  flex-direction: row;
  justify-content: center;
  margin: 10px auto auto;
}

#div-buttons {
  display: flex;
  flex-direction: row;
  justify-content: center;
  margin-top: 20px;
}

#button-random-color {
  width: 100px;
  height: 50px;
  text-align: center;
}

#clear-board {
  width: 100px;
  height: 50px;
  text-align: center;
}

#board-size {
  width: 100px;
  height: 50px;
  text-align: center;
}

#color-selected {
  width: 40px;
  height: 40px;
  padding: 5px;
  border-radius: 20%;
  margin: 5px;
  background-color: black;

}

#pixel-board {
  background-color: rgb(21, 1, 66);
  box-shadow: 0 0 20px 0 black;
  display: grid;
  grid-template-columns: repeat(5, 5fr);
  justify-content: center;
  align-items: center;
  width: 560px;
  height: 560px;
  margin: 20px auto 20px;
  padding: 0;
}

.color {
  
  box-shadow: 0 0 10px 0 black;
  width: 40px;
  height: 40px;
  padding: 5px;
  border-radius: 20%;
  margin: 5px;
}

.pixel {
  border: 1px solid black;
  width: 110px;
  height: 110px;
  background-color: white;
}

#div-container-footer {
  position: absolute;
  bottom: -10;
  color: #FFF;
  width: 99%;
  height: 100px;    
  text-align: center;
}

#p-footer {
  color: azure;
}