*{
    margin: 0;
    padding: 0;
    box-sizing: border border-box;
}
header{
    position: fixed;
    top: 0;
    width: 100%;
    height: 10vh;
    line-height: 10vh;
    box-shadow: 1px 1px 10px 0 rgba(0, 0, 0, .2), -3px -3px 10px 0 #fff;
    z-index: 3;
    background-color: #fa991b60;
}
header h1{
    text-align: center;
}
body{
    text-transform: uppercase;
    background-color: #f3a53ed3;
}

.HOME a{
	font-size: 16px;
	font-weight: bold;
	height: 20px;
    width: 100px;
	float: left;
	color: black;
	transition: 300ms; 
	border-radius: 30px;
}

.calendar{
    display: flex;
    margin: 15vh auto;
    width: 95%;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 1rem;
}
.calendaar{ 
    box-shadow: 1px 1px 10px 0 rgba(0, 0, 0, .2), -3px -3px 10px 0 #fff;
    border-radius: 15px;
    padding: 10px;
}
.calendaar h1{
    text-align: center;
    padding: 1rem;
}
.calendaar ul {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    list-style: none;
}
li {
    padding: 5px;
    text-align: center;
}

li:nth-child(7n + 1){
    color: #f71414;
}
li:nth-child(7n - 1){
    color: #4815ff;
}

.prevmonth,
.prevmonth~li{
    opacity: .5;
}

.FirstDay,
.FirstDay~li {
    opacity: 1 !important;
    font-weight: 900;
}

.LastDay~li {
    opacity: .5 !important;
    font-weight: 200;
}