Base.css

*{
    margin:0;
    padding: 0;
    box-sizing: border-box;
}

:root{
    --Color1:#052f5c;
    --Color2:#132f88;
    --Color3:#35022f;
    --Color4:#fffbfa;
    font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
}

header {
    background-color: var(--Color1);
    height: 10vh;
    text-align: center;
}

H1{
    padding: .5vh;
    color: var(--Color4);
    text-align: center;
}

nav > ul > li {
    display: inline;
    padding: 4px;
}

a{
    color: var(--Color4);
    text-decoration: none;
}

a:hover {
    color: var(--Color4);
    font-size: large;
    font-weight: bolder;
    padding: 1px;
}

main,article {
    background-color: var(--Color2);
    min-height: 100vh;
    padding: 20px;
}
 
article img{
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 80%;
}

form {
    width: 500px;
    margin: 0 auto;
    text-align: left;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

input,textarea {
  width: 100%;
  padding: 12px 20px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  font-size: 16px;
}

input[type="submit"] {
    background-color: #4caf50;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
  }
  
input[type="submit"]:hover {
    -webkit-animation: heartbeat 1.5s ease-in-out infinite both;
    animation: heartbeat 1.5s ease-in-out infinite both;
}

input[type="reset"]:hover {
background-color: red;
}

.animacion1 {
    animation: efectoanimado 2s 2.5;
}
                
button {
    padding:15px;
    border-radius: 5px;
    font-weight: 600;
}

button:hover {
    -webkit-animation: heartbeat 1.5s ease-in-out infinite both;
    animation: heartbeat 1.5s ease-in-out infinite both;
}

.embed-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    justify-content: center;
    align-items: center;
}

.embed-container iframe {
    position: absolute;
    top:0;
    left: 0;
    width: 80%;
    height: 80%;
    justify-content: center;
    align-items: center;
}

footer {
    background-color: var(--Color3);
    height: 10vh;
    color: var(--Color4);
    text-align: center;
    padding: 3vh;
}

.flex-container {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  align-content: center;
}
.flex-container img {
    height: 250px;
    object-fit: cover;
  }
  
.flex-items:nth-child(1) {
  display: block;
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  align-self: center;
  order: 0;
  margin: 0 auto;
}
.flex-container2 {
  display: inline-flex;
  flex-direction: column;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  align-content: center;
}

.flex-items2:nth-child(1) {
  display: block;
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  align-self: center;
  order: 0;
}

.flex-items2:nth-child(2) {
  display: block;
  flex-grow: 0;
  flex-shrink: 1;
  flex-basis: auto;
  align-self: center;
  order: 0;
}

/* ----------------------------------------------
 * Generated by Animista on 2023-7-3 9:59:9
 * Licensed under FreeBSD License.
 * See http://animista.net/license for more info. 
 * w: http://animista.net, t: @cssanimista
 * ---------------------------------------------- */

/**
 * ----------------------------------------
 * animation heartbeat
 * ----------------------------------------
 */

 @-webkit-keyframes heartbeat {
        from {
                -webkit-transform: scale(1);
                transform: scale(1);
                -webkit-transform-origin: center center;
                transform-origin: center center;
                -webkit-animation-timing-function: ease-out;
                animation-timing-function: ease-out;
        }

        10% {
                -webkit-transform: scale(0.91);
                transform: scale(0.91);
                -webkit-animation-timing-function: ease-in;
                animation-timing-function: ease-in;
        }

        17% {
                -webkit-transform: scale(0.98);
                transform: scale(0.98);
                -webkit-animation-timing-function: ease-out;
                animation-timing-function: ease-out;
        }

        33% {
                -webkit-transform: scale(0.87);
                transform: scale(0.87);
                -webkit-animation-timing-function: ease-in;
                animation-timing-function: ease-in;
        }

        45% {
                -webkit-transform: scale(1);
                transform: scale(1);
                -webkit-animation-timing-function: ease-out;
                animation-timing-function: ease-out;
        }
}

@keyframes heartbeat {
        from {
                -webkit-transform: scale(1);
                transform: scale(1);
                -webkit-transform-origin: center center;
                transform-origin: center center;
                -webkit-animation-timing-function: ease-out;
                animation-timing-function: ease-out;
        }

        10% {
                -webkit-transform: scale(0.91);
                transform: scale(0.91);
                -webkit-animation-timing-function: ease-in;
                animation-timing-function: ease-in;
        }

        17% {
                -webkit-transform: scale(0.98);
                transform: scale(0.98);
                -webkit-animation-timing-function: ease-out;
                animation-timing-function: ease-out;
        }
    33% {
            -webkit-transform: scale(0.87);
            transform: scale(0.87);
            -webkit-animation-timing-function: ease-in;
            animation-timing-function: ease-in;
    }
    45% {
            -webkit-transform: scale(1);
            transform: scale(1);
            -webkit-animation-timing-function: ease-out;
            animation-timing-function: ease-out;
    }
  }
  
@keyframes efectoanimado {
    0% {
        opacity: 0.5;
}
    50% {
        opacity: 1;
}
100% {
    opacity: 0.5;

}
}

/* 320px */
@media only screen and (max-width: 800px) {
article img{
  width: 100%;
}
main,article {
    min-height: 50vh;
    padding: 0px;
}
nav{
    display:none;
}
header {
    height: 15vh;
}
form {
    width: auto;
    margin: 0 auto;
    text-align: center;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 1px;
  }
  input,
textarea {
  width: 80%;
  padding: 5px;
  margin-bottom: 5px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  font-size: 10px;
}

}