style.css

html {
    background: linear-gradient(to right, #99CC66, #669933);
    width: 100%;
    height: 100%;
}

body {    
    width: 80%;    
    margin-left: auto;
    margin-right: auto;           
    text-align: center;        
    color: #fff;
    font-family: -apple-system,".SFNSText-Regular","San Francisco","Roboto","Segoe UI","Helvetica Neue","Lucida Grande",Arial,sans-serif;
    line-height: 1.5;
    padding: 2em;
}

h1,h2,h3,h4,h5,h6,a {    
    line-height: 1.2;    
    font-weight: bold;
    text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
}

h1 {
    margin-top: 0;
    font-size: 2.441em
}

h2 {
    font-size: 2em
}

h3 {
    font-size: 1.25em
}

a {
    color: #fff;
    font-size: 1em;
    text-decoration: none
}

a:hover {
    text-decoration: underline
}

.weather {
    width:60%;
    margin-left: auto;
    margin-right:auto;
    -webkit-filter: invert(100%);
    filter: invert(100%)
}

.clock{
    line-height: 1.2;    
    font-weight: bold;
    text-shadow: 1px 1px 4px rgba(0,0,0,0.5);
    font-size: 12vw
}

label, input,{
    font-family: -apple-system,".SFNSText-Regular","San Francisco","Roboto","Segoe UI","Helvetica Neue","Lucida Grande",Arial,sans-serif;
}

.button {
    display: inline-block;
    margin: 1em;
    padding: 0.5em 1em;
    color: #fff !important; 
    font-family: -apple-system,".SFNSText-Regular","San Francisco","Roboto","Segoe UI","Helvetica Neue","Lucida Grande",Arial,sans-serif;       
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    background-color: #6c3;
    border: 0 !important;
    border-radius: 4px;
    cursor: pointer;
    box-shadow: 0 5px 12px 0px rgba(0,0,0,0.2);
}

.grid {
    display: flex;
    justify-content: space-evenly;
  }

.col {
    flex: 1;    
}

  @media screen and (max-width:600px) {
    .grid {
        display: block;
    } 
    .col {        
        width: 100%;
    }
}

ul li {        
    list-style:none;
    margin-left: -1.5em;
  }
  
  .removebtn { 
    border:none;
    background: none;
    color: #fff;
  }
  
  .removebtn:hover {
    opacity: 0.7;
  }
  
  #add-link-form-l,  #add-link-form-c, #add-link-form-r{
    display:none;
    background: #444;
    padding:20px;
    color: #ccc;
    box-shadow: 0 5px 12px 0px rgba(0,0,0,0.2);
    border-radius: 1em;
  }
  
  #add-link-form-l #add-link-form-c #add-link-form-r input {
    margin: 5px 0;
    width:250px;
    color: #333;
    padding:5px;
    outline:none;
    border:none;
  }