body {
    padding: 0;
    margin: 0;
    font-family: avenir, avenext, helvetica nueue, helvetica, arial;
    position: relative;
    z-index: 1
}

::placeholder { /* Chrome, Firefox, Opera, Safari 10.1+ */
    color: #a5a5a5;
    opacity: 1; /* Firefox */
}

b, strong, h1, h2, h3, h4  { font-weight: 600; }