:root {
    font-size: 16px;
}

body {
    background-color: #c5c5c5;
    font-family: Arial, Helvetica, Verdana, Geneva, sans-serif;
    margin: 0;
}

img {
    max-width: 100%;
}

.l-page {
    display: flex;
    flex-direction: column;
}

@media screen and (min-width: 768px) {
    .l-page {
        flex-direction: row;
        max-width: 1200px;
        margin: 0 auto;
    }
}

.l-page__content {
    width: 100%;
    background-color: #D9E8F9;
}

@media screen and (min-width: 768px) {
    .l-page__content {
        width: 90%;
    }
}

.m-header {
    background-color: #5294de;
}

.m-header__content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
}

.m-header__content--logo {
    position: relative;
    bottom: -18px;
    margin: 0 auto;
}

@media screen and (min-width: 768px) {
    .m-header__content--logo {
        margin-left: 0rem;
    }
}
<!-- Die Zeile gibt an, wei weit das Logo von links entfernt ist Original: 1,5rem-->
.m-header__content--banner {
    position: relative;
    display: none;
    margin: 15px 5px 15px auto;
}

@media screen and (min-width: 768px) {
    .m-header__content--banner {
        display: inline-flex;
        margin-right: 0;
    }
}

.m-header__footer {
    min-height: 18px;
    width: 100%;
    border-top: 3px solid black;
    background-color: #feff00;
}

.m-header__footer--inner {
    display: none;
    flex-direction: row;
    max-width: 1200px;
    margin: 0 auto;
}

@media screen and (min-width: 768px) {
    .m-header__footer--inner {
        display: flex;
    }
}

.m-header__footer--inner-dummy {
    width: 17.5%;
    min-width: 229px;
}

.m-header__footer--inner-breadcrumb {
    padding: 2.5px 25px;
    overflow: hidden;
    display: flex;
}

.m-header__footer--inner-breadcrumb span {
    margin-right: 5px;
}

.m-header__footer--inner-breadcrumb ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.m-header__footer--inner-breadcrumb ul li {
    display: inline;
}

.m-header__footer--inner-breadcrumb ul li a {
    color: black;
    text-decoration: none;
}

.m-header__footer--inner-breadcrumb ul li a:hover {
    text-decoration: underline;
}

.m-header__footer--inner-breadcrumb ul li:not(:last-child):after {
    content: ">";
}

.m-navbar {
    background-color: black;
    color: white;
    display: flex;
    flex-direction: column;
}

.m-navbar-red {
    background-color: #e33c33;
}

.m-navbar-blue {
    background-color: #5294de;
}

.m-navbar-green {
    background-color: #729126;
}

.m-navbar-yellow {
    background-color: #ab7d2b;
}

.m-navbar-grey {
    background-color: #8d8d8d;
}

@media screen and (min-width: 768px) {
    .m-navbar {
        width: 19%;
        min-width: 229px;
    }
}

.m-navbar__mainItems {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 10px 15px;
    cursor: pointer;
}

.m-navbar__mainItems--headline {
    font-size: 0.95rem;
}

.m-navbar__mainItems--toggleIcon div {
    width: 35px;
    height: 5px;
    background-color: white;
    margin: 5px 0;
}

@media screen and (max-width: 768px) {
    .m-navbar .e-list {
        display: none;
    }

    .m-navbar .visible {
        display: block;
    }
}

@media screen and (min-width: 768px) {
    .m-navbar > .e-list {
        display: block;
    }

    .m-navbar .mobile {
        display: none;
    }
}

.bg {
    background-color: white;
}

.bg-red, .bg-red ul {
    background-color: #e33c33;
}

.bg-blue, .bg-blue ul {
    background-color: #5294de;
}

.bg-green, .bg-green ul {
    background-color: #729126;
}

.bg-yellow, .bg-yellow ul {
    background-color: #ab7d2b;
}

.bg-grey, .bg-grey ul {
    background-color: #8d8d8d;
}

@media screen and (max-width: 768px) {
    .bg-red.dropdown--expanded > .dropdown--link {
        background-color: #b53029;
    }

    .bg-blue.dropdown--expanded > .dropdown--link, .bg-blue .dropdown--expanded > .dropdown--link {
        background-color: #325b88;
    }

    .bg-green.dropdown--expanded > .dropdown--link, .bg-green .dropdown--expanded > .dropdown--link {
        background-color: #4f641a;
    }

    .bg-yellow.dropdown--expanded > .dropdown--link, .bg-yellow .dropdown--expanded > .dropdown--link {
        background-color: #674b1a;
    }

    .bg-grey.dropdown--expanded > .dropdown--link, .bg-grey .dropdown--expanded > .dropdown--link {
        background-color: #6d6d6d;
    }
}

.m-main {
    width: 100%;
    padding: 0 25px 15px;
    box-sizing: border-box;
}

.m-footer {
    border: none;
    border-top: 1px solid black;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    margin: 0 auto;
    padding: 20px 25px;
}

@media screen and (min-width: 768px) {
    .m-footer {
        flex-direction: row;
    }
}

.m-footer__details {
    color: black;
    text-align: center;
}

.m-footer__list {
    list-style: none;
    margin: 15px 0 0;
    padding: 0;
}

@media screen and (min-width: 768px) {
    .m-footer__list {
        margin: 0;
    }
}

.m-footer__list li {
    display: inline;
}

.m-footer__list li a {
    text-decoration: none;
    color: black;
}

.m-footer__list li:not(:last-child):after {
    content: "|";
}

.e-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.e-list__item--link {
    cursor: pointer;
}

@media screen and (max-width: 768px) {
    .e-list__item .dropdown--expanded > .e-list {
        display: block;
        overflow: hidden;
        padding-left: 25px;
    }
}

.e-list__item a {
    display: inline-block;
    padding: 15px;
    color: white;
    text-decoration: none;
}

@media screen and (min-width: 768px) {
    li > .e-list {
        border-left: 1px solid black;
    }

    .e-list__item ~ .dropdown--expanded > .e-list {
        padding-left: 0;
    }
}

.dropdown {
    position: relative;
}

.dropdown__content {
    min-width: 200px;
    display: none;
}

@media screen and (max-width: 768px) {
    .dropdown--expanded > .dropdown__content {
        display: inline;
        display: block;
        overflow: hidden;
        padding-left: 25px;
    }
}

@media screen and (min-width: 768px) {
    .dropdown:hover > .dropdown__content {
        display: inline;
    }

    .dropdown__content {
        position: absolute;
        top: 0;
        left: 100%;
        min-width: 200px;
        display: none;
    }
}