button {
    border: none;
    display: block;
    position: relative;
    padding: 0.4em 1.6em;
    font-size: 1.5rem;
    background: transparent;
    cursor: pointer;
    user-select: none;
    overflow: hidden;
    color: white;
    z-index: 1;
    font-family: inherit;
    font-weight: 500;
   }
   
   button span {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: -1;
    border: 4px solid royalblue;
   }
   
   button span::before {
    content: "";
    display: block;
    position: absolute;
    width: 8%;
    height: 500%;
    background: var(--lightgray);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-60deg);
    transition: all 0.3s;
   }
   
   button:hover span::before {
    transform: translate(-50%, -50%) rotate(-90deg);
    width: 100%;
    background: royalblue;
   }
   
   button:hover {
    color: white;
   }
   
   button:active span::before {
    background: #2751cd;
   }


   .fancy {
 background-color: transparent;
 border: 2px solid #000;
 border-radius: 0;
 box-sizing: border-box;
 color: #fff;
 cursor: pointer;
 display: inline-block;
 float: right;
 font-weight: 700;
 letter-spacing: 0.05em;
 margin: 0;
 outline: none;
 overflow: visible;
 padding: 1.25em 2em;
 position: relative;
 text-align: center;
 text-decoration: none;
 text-transform: none;
 transition: all 0.3s ease-in-out;
 user-select: none;
 font-size: 13px;
}

.fancy::before {
 content: " ";
 width: 1.5625rem;
 height: 2px;
 background: black;
 top: 50%;
 left: 1.5em;
 position: absolute;
 transform: translateY(-50%);
 transform-origin: center;
 transition: background 0.3s linear, width 0.3s linear;
}

.fancy .text {
 font-size: 1.125em;
 line-height: 1.33333em;
 padding-left: 2em;
 display: block;
 text-align: left;
 transition: all 0.3s ease-in-out;
 text-transform: uppercase;
 text-decoration: none;
 color: black;
}

.fancy .top-key {
 height: 2px;
 width: 1.5625rem;
 top: -2px;
 left: 0.625rem;
 position: absolute;
 background: #e8e8e8;
 transition: width 0.5s ease-out, left 0.3s ease-out;
}

.fancy .bottom-key-1 {
 height: 2px;
 width: 1.5625rem;
 right: 1.875rem;
 bottom: -2px;
 position: absolute;
 background: #e8e8e8;
 transition: width 0.5s ease-out, right 0.3s ease-out;
}

.fancy .bottom-key-2 {
 height: 2px;
 width: 0.625rem;
 right: 0.625rem;
 bottom: -2px;
 position: absolute;
 background: #e8e8e8;
 transition: width 0.5s ease-out, right 0.3s ease-out;
}

.fancy:hover {
 color: white;
 background: black;
}

.fancy:hover::before {
 width: 0.9375rem;
 background: white;
}

.fancy:hover .text {
 color: white;
 padding-left: 1.5em;
}

.fancy:hover .top-key {
 left: -2px;
 width: 0px;
}

.fancy:hover .bottom-key-1,
 .fancy:hover .bottom-key-2 {
 right: 0;
 width: 0;
}