abc.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
body{
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #9B59B6;
}
.wrapper{
    width: 450px;
    background: #fff;
    border-radius: 10px;
}
.wrapper header{
    display: flex;
    align-items: center;
    padding: 25px 30px 10px;
    justify-content: space-between;
}
header .current-date{
    font-size: 1.45rem;
    font-weight: 500;
}
header .icons span{
 height: 38px;
 width: 38px;
 color:#878787;
 font-size: 1.9rem;
 margin: 0 1px;
 cursor:pointer;
 text-align: center;
 line-height: 38px;
 border-radius: 50%;

}
header .icons span:hover{
    background: #f2f2f2;
}
header .icons span:last-child{
    margin-right: -10px;
}
.calendar{
    padding: 20px;
}

.calendar ul{
    display: flex;
    list-style: none;
    flex-wrap: wrap;
    text-align: center;
}
.calendar .days{
    margin-bottom: 20px;
}
.calendar .weeks li{
    font-weight: 500;
}
.calendar ul li{
    position: relative;
    width: calc(100%/7);
}
.calendar .days li{
    z-index: 1;
    cursor:pointer;
    margin-top: 30px;
}
.days li.inactive{
    color:#aaa;
}
.days li.active{
    color:#fff;
}
.calendar .days li::before{
    position: absolute;
    content: "";
    height: 40px;
    width: 40px;
    top:50%;
    left:50%;
    z-index: -1;
    border-radius: 50%;
    transform: translate(-50%, -50%);
}
.days li:hover::before{
    background: #f2f2f2;
}

.days li.active::before{
    background: #9B59B6;
}