MyFirstBlog/MyBlog/static/base.css

html, body {
    height: 100%;
    margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 800;
    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

#wrapper {
    min-height: 100%;
    margin-bottom: -60px;
}

#footer, #push {
    height: 60px;
}


header.masthead {
    margin-bottom: 50px;
    background: no-repeat center center;
    background-color: #868e96;
    background-attachment: fixed !important;
    position: relative;
    background-size: cover;
    height: calc(100vh);
}

header.masthead .overlay {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background-color: #212529;
    opacity: 0.7;
}

header.masthead .page-heading,
header.masthead .post-heading,
header.masthead .site-heading {
    padding: 200px 0 150px;
    color: white;
}

@media only screen and (min-width: 768px) {
    header.masthead .page-heading,
    header.masthead .post-heading,
    header.masthead .site-heading {
        padding: 200px 0;
    }
}

header.masthead .page-heading,
header.masthead .site-heading {
    text-align: center;
}

header.masthead .page-heading h1,
header.masthead .site-heading h1 {
    font-size: 70px;
    margin-top: 0;
}

header.masthead .page-heading .subheading,
header.masthead .site-heading .subheading {
    font-size: 24px;
    font-weight: 300;
    line-height: 1.1;
    display: block;
    margin: 10px 0 0;
    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

@media only screen and (min-width: 768px) {
    header.masthead .page-heading h1,
    header.masthead .site-heading h1 {
        font-size: 80px;
    }
}

header.masthead .post-heading h1 {
    font-size: 35px;
}

header.masthead .post-heading .meta,
header.masthead .post-heading .subheading {
    line-height: 1.1;
    display: block;
}

header.masthead .post-heading .subheading {
    font-size: 24px;
    font-weight: 600;
    margin: 10px 0 30px;
    font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

header.masthead .post-heading .meta {
    font-size: 20px;
    font-weight: 300;
    font-style: italic;
    font-family: 'Lora', 'Times New Roman', serif;
}

header.masthead .post-heading .meta a {
    color: #fff;
}

@media only screen and (min-width: 768px) {
    header.masthead .post-heading h1 {
        font-size: 55px;
    }

    header.masthead .post-heading .subheading {
        font-size: 30px;
    }
}

/*---------------------------------------
  Pre loader section
-----------------------------------------*/

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    display: flex;
    flex-flow: row nowrap;
    justify-content: center;
    align-items: center;
    background: none repeat scroll 0 0 #ffffff;
}

.spinner {
    border: 1px solid transparent;
    border-radius: 5px;
    position: relative;
}

.spinner:before {
    content: '';
    box-sizing: border-box;
    position: absolute;
    top: 50%;
    left: 50%;
    width: 65px;
    height: 65px;
    margin-top: -10px;
    margin-left: -10px;
    border-radius: 50%;
    border: 1px solid #000000;
    border-top-color: #f9f9f9;
    animation: spinner .9s linear infinite;
}

@-webkit-@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}