app.css

body {
  margin: 0;
  padding: 0;
  background-color: #232323;
  font-family: "Raleway";
}

h1 {
  margin: 0;
  width: 100%;
  background-color: steelblue;
  text-align: center;
  height: 140px;
  color: white;
  text-transform: uppercase;
  font-size: 2em;
  line-height: 1.4em;
  font-weight: 400;
  transition: all 0.8s;
}
h1 span{
  font-size: 1.4em;
  font-weight: 500;
}
#colorDisplay {
  display: block;
}
#container {
  max-width: 600px;
  margin: 20px auto;
}
.squares {
  padding-bottom: 30%;
  background-color: purple;
  float: left;
  width: 30%;
  margin: 1.66%;
  border-radius: 15%;
  transition: all 0.8s;
}
#stripe {
  width: 100%;
  background-color: white;
  margin-top: 0;
  text-align: center;
}
.visible {
  display: none;
}
#div-1 {
  display: flex;
  width: 59%;
  margin: 0 auto;
  justify-content: space-between;
}
#reset {
  color: steelblue;
  outline: none;
  border: none;
  box-shadow: none;
  font-family: "Raleway";
  transition-property: all;
  background-color: white;
  
}
#reset:hover{
  background-color: steelblue;
  color: white;
}

button {
  border: none;
  outline: none;
  height: 100%;
  color: steelblue;
  font-weight: 600;
  font-size: 1em;
  background-color: white;
  transition-property: all;
  transition-duration: 0.8s;
}
button:hover{
  background-color: steelblue;
  color: white;
}

.selected {
  background-color: steelblue;
  color: white;
}

@media screen and (max-width: 414px){
  h1{
    font-size: 1.8em
  }
  h1 span{
font-size: 1.2em;
  }
  #div-1{
    width: 80%;
  }
  #container{
    margin: 40px auto;
  }

}
@media screen and (max-width: 375px){
  #div-1{
    width: 95%;
  }

}