.main-header {
    position: relative;
}

.main-header-img {
    width: 100%;
    object-fit: cover;
    filter: brightness(60%)
}

.main-header-txt {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
    width: 100%;
    color: white;
}

.main-header-txt h1 {
    font-weight: bold;
}

.call-action-btn {
    position:fixed;
    border-radius: 50%;
    display:grid;
    place-items: center;
    color: white;
    height: 60px;
    width: 60px;
    background-color: rgba(37, 211, 102, 0.8);
    z-index: 1000;
    right: 5px;
    bottom: 150px;
}

.call-action-btn img {
    width: 100%;
    padding: 10px;
    filter: invert(1);
}

@media screen and (min-width: 800px) {
    .call-action-btn {
        display: none
    }
}