body{
    marin:0;

}
h1{
    margin:0;
    padding: 1em 0;
}
p{
    margin:0;
    padding: 1em 0;
}
#section-a{
    padding: 2em;
    color: white;
}
#section-a:first-child {
    background:#2690d4;
}

#main-footer{
    padding: 1em;
    background: #000;
    color: white;
    text-align: center;
}
.contact{
    margin:0;
    font-size: 1.4em;
    padding: 0px;
}
.arrow-down{
    width: 100%;
    margin: 0 auto;
    text-align: center;
    
    
}
.arrow-down::after{
    content: "";
    width: 20px;
    height: 20px;
    margin:  auto;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: -80%;
    border-right: 4px solid blue;
    border-bottom: 4px solid blue;
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    -webkit-animation: 2s arrow infinite ease;
    animation: 2s arrow infinite ease;
}
@-webkit-keyframes arrow{
    0%,100% {
        top: 50px;
    }
    50%{
        top: 80px;
    }
}
@keyframes arrow{
    0%,100% {
        top: 50px;
    }
    50%{
        top: 80px;
    }
}
.welcom{
    position: absolute;
    text-align: center;
    float: midle;
    margin: 50px 50px 0px 0px; 
    top: 20%;
    left: 25%;
    right: 25%;
    font-size:50px;
}

.about{
    background-color: rgb(255, 255, 255);
}