@import url('https://fonts.googleapis.com/css?family=Roboto:300,400&subset=cyrillic');

body {
    margin: 0;
    padding: 0;
    cursor: default;
    background: #000;
    font-family: 'Roboto', sans-serif;
}

a {
  color: #fff;
}
@media (min-width: 361px) and (max-width: 2500px) {

    .block {
     position: relative; top: calc(50% - 150px); left: calc(50% - 150px); border-radius: 150px; width: 300px; height: 300px;
    }
}
@media (min-width: 10px) and (max-width: 360px) {

    .block {
     position: relative; top: calc(50% - 150px); left: calc(50% - 150px); border-radius: 150px; width: 300px; height: 300px; 
    }
}