body {
    background-color: #78fcfe;
    display: flex;
    justify-content: center;
    }
.all{
    text-align: center;
    width: 1000px;
    height: 1000px;
    }
h1{
    color: #620001;
    text-shadow: 2px 2px 4px #aaa;
    margin: 50px;
    font-size: 48px;
    animation: shadowPulse 3s infinite ease-in-out;
    }
.form{
    background-color: #7fffd5;
    width: 550px;
    height: 550px;
    margin: 0 auto;
    position: relative;
    border-radius: 5px;
    padding-top: 15px;
    border-radius: 5px;
    }
ul li{
    margin-bottom: 40px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    }
.submit{
    width: 100px;
    height: 50px;
    background-color: #f0efef;
    border: 1px solid #999;
    border-radius: 5px;
    font-size: 20px;
    }
input[type="text"],
input[type="password"] {
    width: 320px;
    height: 45px;
    margin-left: 15px;
    border: 1px solid #999;
    padding: 0 10px;
    font-size: 18px;
    }
.form img{
    position: absolute;
    bottom: 5px;
    width: 200px;
    height: auto;
    animation: horseRun 5s linear infinite;
    }
@keyframes shadowPulse {
    0%, 100% { 
        text-shadow: 2px 2px 5px rgba(255, 0, 0, 0.5); 
        transform: scale(1); 
    }
    50% { 
        text-shadow: 0px 0px 20px rgba(255, 0, 0, 0.8), 2px 2px 5px rgba(0, 0, 0, 0.3); 
        transform: scale(1.05); 
    }
}
@keyframes horseRun {
    0% {
        left: 0px;
        transform: scaleX(1);
    }
    49.9% {
        left: 350px; 
        transform: scaleX(1);
    }
    50% {
        left: 350px; 
        transform: scaleX(-1);
    }
    99.9% {
        left: 0px; 
        transform: scaleX(-1);
    }
    100% {
        left: 0px; 
        transform: scaleX(1);
    }
}