*{
    margin: 0;
    padding: 0;
    font-size: 16px;
    font-family: Arial;
}
body {
    background-color: #f5efe3;
    max-width: 1100px;
    margin: 50px auto 20px;
}
.img_grammar {
    width: 154px;
}
h1{
    font-size: 30px;
    margin-bottom: 30px;
}
h2 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
}
.all_cards {
    background-color: white;
    padding: 15px;
}

.btn_green:hover, .btn_green:focus, .btn_green.focus,.btn_green, a {
    text-decoration: none;
}
.btn_green {
    color: #fff;
    background-color: #5cb85c;
    border-color: #4cae4c;
    padding: 9px 12px;
    font-size: 14px;
    border-radius: 4px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    white-space: normal;
    width: 106px;
    text-align: center;
    margin: 10px 0;
}
.btn_blue {
    color: #fff;
    background-color: #337ab7;
    border-color: #2e6da4;
    padding: 9px 12px;
    font-size: 14px;
    border-radius: 4px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    white-space: normal;
    width: 106px;
    text-align: center;
    float: right;
    margin-top: 20px;
}
.btn_green:hover {
    color: #fff;
    background-color: #449d44;
    border-color: #398439;
}
.card-book {
    display: flex;
    padding: 15px;
    background-color: #f5f5f5;
    border-color: #ddd;
    position: relative;
}
.block_img {
    margin-right: 40px;
}
.download_audio {
    color: black;
    border: 4px solid #2e6da4;
    padding: 6px;
    border-radius: 5px;
    margin-left: 13px;
}
.title_audio {
    background-color: white;
    padding: 10px;
    border-radius: 5px;
    width: 200px;
    min-width: 200px;
    display: inline-table;
}

.line_audio {
    margin-bottom: 7px;
}
.all_audio {
    display: flex;
}
.block_2_audio {
    margin-left: 100px;
}

.block_1_audio, .block_2_audio
{
    width: 50%;
}
.all_audio_down {
    margin: 47px auto 100px;
    text-align: center;
}
.download_audio_all {
    color: #fff;
    background-color: #5cb85c;
    border-color: #4cae4c;
    padding: 9px 12px;
    font-size: 14px;
    border-radius: 4px;
}