html {
    height: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    /*background: linear-gradient(#141e30, #243b55);*/
    background: linear-gradient(108.1deg, rgb(167, 220, 225) 11.2%, rgb(217, 239, 242) 88.9%);
}

.login-box {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    padding: 40px;
    transform: translate(-50%, -50%) rotate(-15deg);
    background: rgba(0,0,0,.5);
    box-sizing: border-box;
    box-shadow: 0 15px 25px rgba(0,0,0,.6);
    border-radius: 10px;
    animation: rotate-in 1s ease-in-out;
    animation-name: spin-in;
    animation-duration: 1s;
    animation-timing-function: ease-out;
    animation-fill-mode: forwards;
}

@keyframes spin-in {
    0% {
        transform: translate(-50%, -50%) rotate(-45deg);
        opacity: 0;
    }

    100% {
        transform: translate(-50%, -50%) rotate(0deg);
        opacity: 1;
    }
}

.login-box h2 {
    margin: 0 0 30px;
    padding: 0;
    color: #fff;
    text-align: center;
}

.login-box .user-box {
    position: relative;
}

    .login-box .user-box input {
        width: 100%;
        padding: 10px 0;
        font-size: 16px;
        color: #fff;
        margin-bottom: 30px;
        border: none;
        border-bottom: 1px solid #fff;
        outline: none;
        background: transparent;
    }

    .login-box .user-box label {
        position: absolute;
        top: 0;
        left: 0;
        padding: 10px 0;
        font-size: 16px;
        color: #fff;
        pointer-events: none;
        transition: .5s;
    }

    .login-box .user-box input:focus ~ label,
    .login-box .user-box input:valid ~ label {
        top: -20px;
        left: 0;
        color: #03e9f4;
        font-size: 12px;
    }

.login-box form button {
    position: relative;
    display: inline-block;
    padding: 10px 20px;
    color: #03e9f4;
    background: rgba(0,0,0,.5);
    border-radius: 10px;
    border: none;
    font-size: 16px;
    text-decoration: none;
    text-transform: uppercase;
    overflow: hidden;
    transition: .5s;
    margin-top: 40px;
    letter-spacing: 4px
}

.login-box button:hover {
    background: #03e9f4;
    color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 5px #03e9f4, 0 0 25px #03e9f4, 0 0 50px #03e9f4, 0 0 100px #03e9f4;
}

.login-box button span {
    position: absolute;
    display: block;
}

    .login-box button span:nth-child(1) {
        top: 0;
        left: -100%;
        width: 100%;
        height: 2px;
        background: linear-gradient(90deg, transparent, #03e9f4);
        animation: btn-anim1 1s linear infinite;
    }

@keyframes btn-anim1 {
    0% {
        left: -100%;
    }

    50%,100% {
        left: 100%;
    }
}

.login-box a span:nth-child(2) {
    top: -100%;
    right: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, #03e9f4);
    animation: btn-anim2 1s linear infinite;
    animation-delay: .25s
}

@keyframes btn-anim2 {
    0% {
        top: -100%;
    }

    50%,100% {
        top: 100%;
    }
}

.login-box a span:nth-child(3) {
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(270deg, transparent, #03e9f4);
    animation: btn-anim3 1s linear infinite;
    animation-delay: .5s
}

@keyframes btn-anim3 {
    0% {
        right: -100%;
    }

    50%,100% {
        right: 100%;
    }
}

.login-box a span:nth-child(4) {
    bottom: -100%;
    left: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(360deg, transparent, #03e9f4);
    animation: btn-anim4 1s linear infinite;
    animation-delay: .75s
}

@keyframes btn-anim4 {
    0% {
        bottom: -100%;
    }

    50%,100% {
        bottom: 100%;
    }
}

.loginput::-webkit-input-placeholder {
    color: #03e9f4;
}

.text-danger {
    color: red !important;
}