body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    padding : 0;
}
header {
    background-color: #222;
    color: white;
    padding : 12px;
    text-align: center;
}
.promo {
    background-image: url(../images/phonebgrd.jpg);
    background-size: 100%;
    opacity: 0.5;
    height: 300px;
    display:flex;
    align-items: center;
    justify-content: center;
    color : white;
    font-size : 4em;
    text-shadow: 3px 3px 2px black;
    color : yellow;
}
.description {
    display: flex;
    flex-wrap: wrap;
    gap : 12px;
    padding : 20px;
    justify-content: center;

}
.feature {
    flex : 1 1 200 px;
    border : 1px solid #ccc;
    padding : 12px;
    border-radius: 8px;
}
.action {
    background: #28a745;
    color : white;
    padding : 30px;
    text-align: center;
}
.action button {
    padding : 15px 30px;
    border-radius : 10px
}
button:hover{
    background-color : #abe7f5
}