style1.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 0px;
    height: 100%;
    width: 100%;
    background: #373c48;
    transition: background 0.3s;
}

header {
    background: #23262e;
    position: absolute;
    top: 0;
    width: 100%;
    height: 75px;
    transition: background 0.3s;
}

.logo {
    display: flex;
    width: 30%;
    float: left;
}

.logo img {
    padding-top: 9px;
    height: 60px;
    filter: brightness(0) invert(1);
    margin-left: 10px;
}

.nav ul {
    display: flex;
    width: 57%;
    align-items: center;
}

.nav li {
    background: #373c48;
    padding: 10px;
    margin: 10px;
    border-radius: 50px;
    cursor: pointer;
    position: relative;
    left: 60%;
    top: 4px;
    list-style: none;
}

.nav li a {
    color: antiquewhite;
    text-decoration: none;
}

button {
    padding: 2px;
    width: 35px;
    border-radius: 50px;
    border: #23262e;
    cursor: pointer;
    transition: background 0.3s;
}

button span {
    margin-left: 2 px;
    display: block;
    height: 15px;
    width: 15px;
    background: rgb(113, 116, 113);
    border-radius: 50%;
    transition: background 0.3s, margin-left 0.3s;
}

.content {
    margin: 100px;
    margin-bottom: 50px;
}

footer {
    background: #23262e;
    height: 200px;
    transition: background 0.3s;

}

.active {
    background: rgb(113, 116, 113);
}

.active span {
    background: #fff;
    margin-left: 15px
}

.light_body {
    background: #dcd9d1;
}

.light_hf {
    background: #aaa8a3;
}