:root {
    --color1: #05b1b1;
    --color2: #52339a;
}
.color1 {
    color: var(--color1);
}
.color2 {
    color: var(--color2);
}
.bg1 {
    background-color: var(--color1);
}
.bg2 {
    background-color: var(--color1);
}

.about, .itd_accordion, .about_author, .buy {
    background-color: #eee;
}
/*Accordion_colors*/
.accordion-button:not(.collapsed) {
    color: white;
    background-color: var(--color2);
}

.accordion-button:not(.collapsed)::after {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='white'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e")
}

header, section, footer {
    padding: 100px 0;
}
header {
    padding: 200px 0;
}
header, footer {
    background: url(../img/pattern.png), var(--color1);
    background: url(../img/pattern.png), -moz-linear-gradient(left, var(--color1) 0%, var(--color2) 100%);
    background: url(../img/pattern.png), -webkit-linear-gradient(left, var(--color1) 0%, var(--color2) 100%);
    background: url(../img/pattern.png), linear-gradient(to right, var(--color1) 0%, var(--color2) 100%);
    filter: url(../img/pattern.png), progid:DXImageTransform.Microsoft.gradient( startColorstr=var(--color1),
    endColorstr=var(--color2),GradientType=1 );
    background-size: contain;
}
.itd_play {
    width: 60px;
    height: 60px;
    background-color: var(--color1);
    border-radius: 50px;
    display: flex;
    margin: 30px auto;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}
.itd_play:hover{
    background-color: var(--color2);
}
.itd_triangle {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 20px;
    border-color: transparent transparent transparent white;
    margin-left: 3px;
}
.btn-itd {
    display: block;
    max-width: 200px;
    margin: 0 auto;
    background-color: var(--color2);
    color: white;
    border: none;
}
.btn-itd:hover{
    background-color: var(--color1);
    color: white;
    border: none;
}

.embed-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 100%;
}

.embed-container iframe, .embed-container object, .embed-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.itd_circle{
    display: flex;
    justify-content: center;
    align-items: center;
}

.itd_div_about {
    border: black ;
    justify-content: center;
    align-items: center;
    padding: 30px;
}
.itd_circle{
    display: flex;
    justify-content: center;
    align-items: center;
}
.itd_icon{
    display: block;
    border: var(--color2) solid;
    color: var(--color2);
    border-radius: 100%;
    font-size: 30px;
    padding: 10px;
    margin-bottom: 20px;
}
.underline {
    margin: 0 auto;
    width: 120px;
    border-top: var(--color1) solid;
}
.itd_central h5 {
    padding: 50px 30px;
    border: var(--color1) solid;
}
.itd_program h5 {
    padding: 40px 25px;
    border: var(--color1) solid;
}
.itd_img_author{
    width: 280px;
}
.about_author {
    padding-bottom: 0;
}
.review .underline {
    margin: 0 auto;
    width: 120px;
    border-top: var(--color2) solid;
}
.people {
    border: var(--color1) solid;
}
.itd_img_buy{
    height: 400px;
}
footer a:hover {
    background-color: var(--color2);
}