ul {list-style-type: none;}

.calendar * {
    margin: 0;
}

.month {
    width: 100%;
    text-align: center;
    align-content: center;
}

.month ul {
    margin: 0;
    padding: 0.5rem;
}

.month ul li {
    display: inline;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.month .prev {
    float: inline-start;
    cursor: pointer;
}

.month .next {
    float: inline-end;
    cursor: pointer;
}

.weekdays {
    padding: 10px 0 0 0;
}

.weekdays li {
    display: inline-block;
    width: 13.6%;
    text-align: center;
}

.days {
    padding: 10px 0;
    margin: 0;
}

.days li {
    list-style-type: none;
    display: inline-block;
    width: 13.6%;
    text-align: center;
    margin-bottom: 5px;
    font-size: smaller;
    cursor: pointer;
}

.days li .active {
    padding: 5px;
    border-radius: 30%;
}

@media screen and (max-width: 720px) {
    .weekdays li, .days li {width: 13.1%;}
}

@media screen and (max-width: 420px) {
    .weekdays li, .days li {width: 12.5%;}
    .days li .active {padding: 2px;}
}

@media screen and (max-width: 290px) {
    .weekdays li, .days li {width: 12.2%;}
}