css

body{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background:#130f40;
}

.box{
    width: 300px;
    padding: 40px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #2c3e50;
    border: 0;
    border-radius: 10px;
    text-align: center;
}

.box a{
    color: white;
    text-transform: uppercase;
    font-weight: 500;
}

.box input[type = "text"], .box input[type = "password"]{
    color: black;
    display: block;
    margin: 20px auto;
    background: none;
    border: 2px solid #00b894;
    text-align: center;
    padding: 14px 10px;
    width: 200px;
    outline: none;
    border-radius: 24px;
    transition: 0.25s;
}

.box input[type = "text"]:focus, .box input[type = "password"]:focus{
    border-color: #74b9ff;
    width: 280px;
}

.box input[type = "submit"]{
    display: block;
    margin: 20px auto;
    background: none;
    border: 2px solid #74b9ff;
    text-align: center;
    padding: 14px 40px;
    outline: none;
    color: white;
    border-radius: 24px;
    transition: 0.25s;
    cursor: pointer;
}

.box input[type = "submit"]:hover{
    background:#74b9ff;
    box-shadow: 0 0 10px #74b9ff, 0 0 40px #74b9ff, 0 0 80px #74b9ff;
    transition-delay: 0.1s;
}

.box span{
    position: absolute;
    display: block;
}

form span:nth-child(1){
    top: 0;
    left: -100%;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg,transparent,#3498db);
}

form:hover span:nth-child(1){
    left: 100%;
    transition: 1s;
}

form span:nth-child(3){
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 5px;
    background: linear-gradient(270deg,transparent,#3498db);
}

form:hover span:nth-child(3){
    right: 100%;
    transition: 1s;
    transition-delay: 0.5s;
}

form span:nth-child(2){
    top: -100%;
    right: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg,transparent,#3498db);
}

form:hover span:nth-child(2){
    top: 100%;
    transition: 1s;
    transition-delay: 0.25s;
}

form span:nth-child(4){
    bottom: -100%;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(360deg,transparent,#3498db);
}

form:hover span:nth-child(4){
    bottom: 100%;
    transition: 1s;
    transition-delay: 0.75s;
}