body {
    display: grid;
    place-items: center;
    height: 100vh;
    margin: 0;
}

.main {
    transform: translateX(500px);
    -webkit-transform: translateX(500px);
    -moz-transform: translateX(500px);
    -ms-transform: translateX(500px);
    -o-transform: translateX(500px);
    display: flex;
    justify-content: space-between;
    align-items: start;
}
.calender {
    background-color: #111111;
    border-radius: 10px;
    -webkit-border-radius: 10px;
    -moz-border-radius: 10px;
    -ms-border-radius: 10px;
    -o-border-radius: 10px;
    box-shadow: 0 0 30px #222222;
    overflow: hidden;
    width: 400px;
    color: #fff;
    padding: 30px 30px 35px;
}
.header-calender {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
}
.btn {
    cursor: pointer;
}

#month-year {
    font-weight: bold;
    font-size: 20px;
}
.weekdays, .days {
    display: flex;
    flex-wrap: wrap;
}
.days {
    height: 240px;
}
.weekdays div, .days div {
    width: 14.28%;
    text-align: center;
    padding: 10px;
    border-radius: 5px;
    -webkit-border-radius: 5px;
    -moz-border-radius: 5px;
    -ms-border-radius: 5px;
    -o-border-radius: 5px;
}
.days div {
    cursor: pointer;
    transition: background-color 0.3s;
    -webkit-transition: background-color 0.3s;
    -moz-transition: background-color 0.3s;
    -ms-transition: background-color 0.3s;
    -o-transition: background-color 0.3s;
}

.days div:hover {
    background-color: white;
    color: orangered;
}
.days .today {
    background-color: orangered;
    color: #fff;
}

.days .fade {
    color: #555;
}

@media (max-width: 960px) {
    .main {
        transform: translateX(400px);
        -webkit-transform: translateX(400px);
        -moz-transform: translateX(400px);
        -ms-transform: translateX(400px);
        -o-transform: translateX(400px);
    }
}
@media (max-width: 750px) {
    .main {
        transform: translateX(250px);
        -webkit-transform: translateX(250px);
        -moz-transform: translateX(250px);
        -ms-transform: translateX(250px);
        -o-transform: translateX(250px);
}
}
@media (max-width: 670px) {
    .main {
        transform: translateX(200px);
        -webkit-transform: translateX(200px);
        -moz-transform: translateX(200px);
        -ms-transform: translateX(200px);
        -o-transform: translateX(200px);
}
}

@media (max-width: 600px) {
    .main {
        transform: translateX(150px);
        -webkit-transform: translateX(150px);
        -moz-transform: translateX(150px);
        -ms-transform: translateX(150px);
        -o-transform: translateX(150px);
}
}