.section-intro {
    background: linear-gradient(45deg, #272262, #0080c5);
    color: white;
}

.bg-intro {
    position: relative;
    padding-top: 18vh;
}

.bg-intro::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("https://resources.cdn.haylem.ca/background/letter-background_3988.png");
    background-size: cover;
    background-position: bottom;
    opacity: 1;
    mix-blend-mode: multiply;
}

.bg-intro .container {
    position: relative;
    z-index: 1;
}

.img-intro {
    width: 100%;
    opacity: 0.7;
}

.section-partners {
    padding-top: 9vh;
    padding-bottom: 9vh;
}
.section-partners .container {
    border-radius: 50px;
    background: #ffffff;
    box-shadow:  20px 20px 60px #d9d9d9,
                -20px -20px 60px #ffffff;
}
.collapse-btn .fas{
    transition-duration: 0.3s;
}
.collapse-btn:not(.collapsed) .fas {
    transform: rotate(90deg);
}