main.css

body{
    background-color: #000000;
    margin: 0mm;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.square{
    width: 30%;
    background-color: purple;
    padding-top: 30%;
    float: left;
    margin: 1.6%;
    border-radius: 25%;
    transition: background 0.5s;
}
.container{
    max-width: 600px;
    margin: 20px auto;
    
}
h1{
    color: white;
    background-color: red ;
    /* background-color: #37a2b4 ; */
    text-align: center;
    margin: 0;
    padding: 20px;
    text-transform: uppercase;
}
span{
    color: white;
}
#message{
    display: inline-table;
    width: 20%;
    text-align: center;
    color: red;
}

#stripe{
    background-color: white;
    /* height: 30px; */
    text-align: center;
}

.selected{
    background-color: rgba(255, 0, 0, 0.856);
    color: white;
}

#colorDisplay{
    font-size: 150%;
}

button{
    border: none;
    background: none;
    text-transform: uppercase;
    height: 100%;
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 17px;
    color: black;
    height: 30px;
    margin: 0;
    padding: 0;
    transition: all 0.4s;
    outline: none;
}

button:hover{
    color: white;
    background-color: rgba(255, 0, 0, 0.63);
}