body {
    margin: 0;
    padding: 0; 
    font: bold 16px/20px Arial, sans-serif
}  
.main {
    background: #fafafa; 
    padding: 10px 5%;
} 
.strong {
    font-weight: bold;
}
.regular {
    font-weight: normal;
}
.btn {
    display: inline-block;
    padding: 12px 20px;
    color: black;
    font-size: 14px;
    line-height: 14px;
    background: none;
    border: 2px solid black;
    margin: 10px auto 20px; 
    text-align: center;
    text-decoration: none;

    -webkit-transition: all 0.1s linear;
    -moz-transition: all 0.1s linear;
    -ms-transition: all 0.1s linear;
    -o-transition: all 0.1s linear;
    transition: all 0.1s linear;
} 
.btn:hover {
    background: black;
    color: white;
}
.btn:focus {
    background: #ff7900;
    color: white;
    border-color: #ff7900;
    outline: none;
} 
.offer .benefits {
    list-style-type: square;
    padding-left: 15px;
    margin-bottom: 20px;
}
.offer .benefits li {
    margin-bottom: 15px;
    padding-left: 5px;
}
.offer {
    background: white; 
    max-width: 550px;
    margin: 0 auto 30px auto;
    padding-bottom: 10px;
    -webkit-box-shadow: 1px 1px 7px 1px #ddd;
    box-shadow: 1px 1px 7px 1px #ddd;
}
.offer .inner {
    width: 90%;  
    margin: auto;
} 
.offer img.baner {
    display: block; 
    width: 100%;
    height: auto;
}
.offer h2 {
    font: bold 40px/42px Arial, sans-serif;
    margin: 20px 0 5px 0;
}
.offer h3 {
    font: bold 18px/22px Arial, sans-serif;
    margin: 0 0 20px;
}
.offer p {
    font: bold 16px/20px Arial, sans-serif;
    margin: 0 0 10px;
}
.offer p.regular {
    font-weight: normal;
}
.offer p.strong {
    font-weight: bold;
}
.offer p.description.strong {
    margin-bottom: 0;
}

@media screen and (max-width: 550px) {   

    .offer .btn{
        display: block;  
        margin: 30px auto 20px;
    }
} 

@media screen and (max-width: 420px) {   

    .offer h2 {
        font-size: 30px;
        line-height: 32px;
    }
    .offer .inner {
        width: 80%;   
    } 
    
}