body{
    background:#262626;
}
.container{
    width:900px;
    padding:7.5% 50px;
    margin:0 auto;
}
a{
    width:180px;
    display:inline-block;
    margin:5% 20px;
    padding:20px 0px;
    text-align:center;
    font-family:Arial;
    font-size:20px;
    color:#fff;
    position:relative;
     
    text-decoration:none;
    letter-spacing:1.5px;
}
a:nth-child(1){
    background:red;
    color:#fff;
     
}
a:nth-child(2){
    background:orange;
    color:#fff;
    border-radius:10px;
}
a:nth-child(3){
    background:purple;
    color:#fff;
    border:2px solid #fff;
     
}
a:nth-child(4){
    background:blue;
     
    border:2px solid #fff;
    border-radius:10px;
}
a:nth-child(5){
    background:green;
    color:#fff;
    border:2px dotted yellow;
}
a:nth-child(6){
    background:green;
    color:#fff;
    border:2px dashed white;
}
a:nth-child(7){
    background:yellow;
    color:#000;
    border-radius:30px 0 30px 0;
}
a:nth-child(8){
    background:orangered;
    color:#fff;
    border-radius:0 30px 0 30px;
     
}
a:nth-child(8):hover{
    background:orange;
}
a:nth-child(9){
    background:green;
    color:#f2f2f2;
     
}
a:nth-child(9)::before{
    content: "";
    width:calc(100% - 16px);
    height:calc(100% - 12px);
    position:absolute;
    left:7px;
    top:5px;
    border:2px dashed #fff;
     
}
a:nth-child(10){
    background:#424242;
    color:#fff;
     
}
a:nth-child(10)::before{
    content: "";
    width:calc(100%);
    height:calc(100% - 14px);
    position:absolute;
    left:0px;
    top:5px;
    border-top:2px dashed yellow;
    border-bottom:2px dashed yellow;
}
a:nth-child(11){
    background:#ff00e4;
    color:#fff;
    border-radius:30px;
    text-align:right;
    width:160px;
    padding-right:20px;
     
 
}
a:nth-child(11)::before{
    content: "";
    width:calc(40px);
    height:calc(42px);
    position:absolute;
    left:10px;
    top:10px;
    border-radius:20px;
    background:orange;
}
a:nth-child(12){
     
    color:#fff;
    background:#262626;
    border-radius:30px;
    text-align:right;
    width:150px;
    padding-right:20px;
    border:5px solid #fff;
     
}
a:nth-child(12)::before{
    content: "";
    width:calc(40px);
    height:calc(42px);
    position:absolute;
    left:10px;
    top:10px;
    border-radius:20px;
    background:purple;
     
     
}
a:nth-child(13){
    background:linear-gradient(to right, #0c1700, #81f802, #0c1700);
}
a:nth-child(14){
    background:linear-gradient(-45deg,blue,red);
     
}
a:nth-child(15){
    box-shadow:inset 0px 0px  30px blue;
    background:lime;
}
a:nth-child(16){
     
    box-shadow:0 0 30px skyblue;
     
}