body {
    margin: 0;
    background: #171717;
}

header {
    font-family: Roboto Slab, serif;
    font-style: normal;
    font-weight: bold;
    font-size: 144px;
    line-height: 190px;
    letter-spacing: 0.015em;

    color: #ebebeb;
}

.login_btn {
    width: 10%;
    transition: 50ms;
}

.login_btn:hover {
   width: 11%;
}

.box {
    background: rgba(196, 196, 196, 0.7);
    width: max-content;
    margin: 10px;
}

.box_text {
    font-family: Roboto Slab;
    font-style: normal;
    font-weight: bold;
    font-size: 14px;
    line-height: 18px;
    letter-spacing: 0.015em;
    
    color: #000000;
}

@media screen and (max-width: 812px) {
    header {
        font-size: 95px;
        line-height: 120px;
    }

    .login_btn {
        width: 20%;
    }

    .login_btn:hover {
        width: 21%;
     }

    }