* {
    margin: 0;
    padding: 0;
    font-family: 'Tahoma', sans-serif;
}

div {
    text-align: center;
    border: 1px solid #d5d5d5;
    padding: 50px;
    background-color: #f5f5f5;
}

span {
    font-weight: bold;
}

h1, h2, h3, p {
    text-align: center;
    margin: 15px 0px;   
}

p {
    width: 930px;
    line-height: 28px;
    margin: 15px auto 30px auto;
}

a {
    padding: 10px 30px;
    font-size: 14px;
    font-weight:  bold;
    text-decoration: none;
    background-color: #49b970;
    color: #ffffff;
    border-radius: 25px;
}

.pulse{
    background: none;
    color: #49b970;
    border: 2px solid;
    margin: 50px;
    padding: 15px 40px;
}

.pulse:hover, .pulse:focus {
    color: #fff;
    border-color: #49b970;
    box-shadow: 0 0 0 15px rgba(255, 255, 255, 0);
    animation: pulsar 1s;
}

@keyframes pulsar{
    0% {
        box-shadow: 0 0 0 0 #49b970;

    }   
}