body {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    height: 800px;
    width: 100%;
    background-color: #8ACE00;
}
@font-face {
    font-family: brat;
    src: url(ofont.ru_Arial\ Narrow.ttf);
}

.txt {
    font-family: brat;
    font-size: 30px;
}

.btn-case{
    padding-top: 50px;
}

.btn {
    font-family: brat;
    background-color: rgb(255, 255, 255);
    border: none;
    font-size: 30px;
}